Question

A motorboat goes downstream in a river and covers a distance of 64km in 2 hours, while coming back to the starting point, the boat takes 2\frac{2}{7} hours. The speed of the motorboat in still water and the speed of the stream respectively are :
A. 20km/h and 8km/h
B. 28km/h and 4km/h
C. 30km/h and 2km/h
D. 32km/h and 3km/h ​

Answer 1

Answer:

answer is below.

Step-by-step explanation:

x= speed upstream;  y = speed downstream

64/x+y = 2      64/x-y= 2/7

solve for x and y (option d)

Answer 2

D. 32km/h and 3km/h is the correct answer.