A bullock cart has to cover a distance of 80km in 10hrs. If it covers half of the journey in 3/5th time. what should be its speed to cover the remaining distance in the time left.	Select:
A) 10 kmph  B) 20 kmph  C) 30 kmph  D) 40 kmph  E) 50 kmph

Rationale: a 10 kmph time left = 10 - 3 / 5 * 10 = 4 hr 10 km / h speed = 40 km / 4 hr = 10 kmph
Answer: A