Problem:Females typically give birth once every two to three years at the start of the winter after a gestation period of 10 to 12 months. The calf weighs about 2.5 tonnes (2.8 short tons) and is around 7 metres (23 ft) in length. Blue whale calves drink 380 -- 570 litres (100 -- 150 U.S. gallons) of milk a day. Blue whale milk has an energy content of about 18,300 kJ / kg (4,370 kcal / kg). The calf is weaned after six months, by which time it has doubled in length. The first video of a calf thought to be nursing was made 5 February 2016.

Answer this question: how long does it take for a blue whale to give birth?
Solution:OK... The important part for answering this question is: Females typically give birth once every two to three years at the start of the winter after a gestation period of 10 to 12 months.
10 to 12 months.

Student A:Context: Naturally occurring oxygen is composed of three stable isotopes, O, O, and O, with O being the most abundant (99.762 % natural abundance). Depending on the terrestrial source, the standard atomic weight varies within the range of (15.99903, 15.99977) (the conventional value is 15.999). Known oxygen isotopes range in mass number from 12 to 24.

Question: how many isotopes of oxygen occur naturally on earth?
Student B:OK... The relevant information to answer the above question is: Naturally occurring oxygen is composed of three stable isotopes, O, O, and O, with O being the most abundant (99.762 % natural abundance).
three stable isotopes.

Problem:Passage: "Time in a Bottle" is a hit single by singer-songwriter Jim Croce. Croce wrote the lyrics after his wife Ingrid told him she was pregnant, in December 1970. It appeared on his 1972 ABC debut album You Do n't Mess Around with Jim. ABC originally did not intend to release the song as a single; but when Croce was killed in a plane crash in September 1973, the song's lyrics, dealing with mortality and the wish to have more time, had additional resonance. The song subsequently received a large amount of airplay as an album track and demand for a single release built. When it was eventually issued as a 7 '', it became his second and final No. 1 hit. After the single had finished its two-week run at the top in early January 1974, the album You Do n't Mess Around with Jim became No. 1 for five weeks. In 1977, "Time in a Bottle" was used as the title for a compilation album of Croce's love songs.

Question: Based on this passage, who sang if i could save time in a bottle?
Solution:OK... The important part for answering this question is: "Time in a Bottle" is a hit single by singer-songwriter Jim Croce.
singer - songwriter Jim Croce.

Student A:Costco's worldwide headquarters are in Issaquah, Washington, but the company opened its first warehouse in nearby Seattle in 1983. Through mergers, Costco's corporate history dates back to 1976, when its former competitor Price Club was founded in San Diego, California. As of March 7, 2018, Costco had a total of 749 warehouses; In the United States (519), Canada (98), Mexico (38), United Kingdom (28), Japan (26), South Korea (14), Taiwan (13), Australia (9), Spain (2), Iceland (1) and France (1).

Answer this question: how many costco's are there in the united states?
Student B:OK... This is the relevant information: As of March 7, 2018, Costco had a total of 749 warehouses; In the United States (519), Canada (98), Mexico (38), United Kingdom (28), Japan (26), South Korea (14), Taiwan (13), Australia (9), Spain (2), Iceland (1) and France (1).
519.

Problem:Context: The South Downs Way is a long distance footpath and bridleway running along the South Downs in southern England. It is one of 15 National Trails in England and Wales. The trail runs for 160 km (100 mi) from Winchester in Hampshire to Eastbourne in East Sussex, with about 4,150 m (13,620 ft) of ascent and descent.

Question: where does the south downs way start and finish?
Solution:OK... The relevant sentence in the passage is: The trail runs for 160 km (100 mi) from Winchester in Hampshire to Eastbourne in East Sussex, with about 4,150 m (13,620 ft) of ascent and descent.
from Winchester in Hampshire to Eastbourne in East Sussex.

Problem:The Vampire Diaries is an American supernatural drama television series developed by Kevin Williamson and Julie Plec, based on the popular book series of the same name written by L.J. Smith. The series premiered on The CW on September 10, 2009, and concluded on March 10, 2017, airing 171 episodes over eight seasons.

Answer this question: when was the first vampire diaries episode released?
Solution:
OK... This is the relevant information: The series premiered on The CW on September 10, 2009, and concluded on March 10, 2017, airing 171 episodes over eight seasons.
September 10 , 2009.