kareena, Saif, and a puppy start walking down a road.
They start at the same time, from the same point, in the same direction.
The saif walks at 5 miles/hour
kareena at 6 miles/hour.
The puppy runs from saif to kareena and back again with a constant speed of 10 miles/hour.
The puppy does not slow down on the turn.
How far does the puppy travel in 1 hour?
Pick.
A) 10 miles B) 14 miles C) 12 miles D) 20 miles E) 30 miles

Rationale: a 10 miles speed us 10 miles / hour
Answer: A