The speed of a boat in still water is 20 km/hr and the rate of current is 5 km/hr. The distance traveled downstream in 15 minutes is: Choose the correct choice from the following options:
A) 9.25  B) 5.25  C) 7.25  D) 6.25  E) 5.1

Rationale: "explanation : speed downstream = ( 20 + 5 ) kmph = 25 kmph distance travelled = ( 25 * ( 15 / 60 ) ) km = 6.25 km . answer : d"
Answer: D