Question 72

A boat travels upstream from B to A and downstream from A to B in 3 hours. If the speed of the boat in still water is 9 km/hr and the speed of the current is 3 km/hr, what is the distance between A and B?

Name: A boat travels upstream from B to A and downstream from A to B in 3 hours. If the speed of the boat in still water is 9 km/hr and the speed of the current is 3 km/hr, what is the distance between A and B?
Uploaded: 2026-01-30T12:33:06.452161+05:30
Duration: 3 min 44 s
Description: A boat travels upstream from B to A and downstream from A to B in 3 hours. If the speed of the boat in still water is 9 km/hr and the speed of the current is 3 km/hr, what is the distance between A and B?

Solution

Let the distance between A and B = 'D' km

Sspeed of the boat in still water =9 km/h

Sspeed of the current =3 km/h

Upstream speed = 9 - 3 = 6 km/h

Downstream speed = 9 + 3 = 12 km/h

Now,

$$\frac{D}{6} + \frac{D}{12} = 3$$

2D + D = 36

D = 12 km

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