Question

A motorboat whose speed in still water is 16 km/h, took 8 hours to cover a journey 63 km upstream and return. The next day, the speed of the stream was doubled. How long would it take to cover the same distance upstream and return?



a. 8 hours 40 minutes



b. 8 hours 24 minutes



c. 8 hours 30 minutes



d. 9 hours



e. 8 hours 48 minutes

Answer 1

b is the right answer (8 hours 24 minutes)