Question

A man can row 5 km/h in still water. If the speed of the current is 1 km/h, it takes 3 h more upstream than in the downstream for the same distance. The distance is

Options

• 36 km

• 24 km

• 20 km

• 32 km

Answer 1

36 km

Explanation:

Let the distance be = d

Speed of a boat in upstream = 5 − 1 = 4 km/h

Speed of a boat in downstream = 5 + 1 = 6 km/h

According to the question,

`"d"/4-"d"/6=3`

`(3"d"-2"d")/12=3`

d = 36 km