A horse chases a pony 3 hours after the pony runs. Horse takes 4 hours to reach the pony. If the average speed of the horse is 35 kmph, what s the average speed of the pony? Choices
A) 20 kmph  B) 22 kmph  C) 24 kmph  D) 26 kmph  E) 28 kmph

Rationale: "pony take 7 hours and horse take 4 hours . . . then distance chased by them is 35 * 4 . so speed of pony is ( 35 * 4 ) / 7 = 20 kmph . answer : a"
Answer: A