Question

A person can row a distance of one km upstream in ten minutes and downstream in four minutes. What is the speed of the stream?

Options

• 4.5 km/h

• 4 km/h

• 9 km/h

• 5.6 km/h

Answer 1

4.5 km/h

Explanation:

`x - y = 1/(10/60)` = 6

`x + y = 1/(4/60)` = 15

`y = (15 - 6)/2` = 4.5 kmph