Question

Solve the following question and mark the best possible option.
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, the distance between A and B(in km) is

पर्याय

• 4

• 6

• 8

• 12

Answer 1

let the distance between A and B be d.
Now,
`d/(9 + 3) + d/(9 - 3) = 3`

`d/12 + d/6 = 3`

D = 12 km.