A river of width 200m is flowing from west to east with a speed of 18?km/h. A boat, moving with speed of 36?km/h in still water, is made to travel one-round trip (bank to bank of the river). Minimum time taken by the boat for its

Question

A river of width 200 m is flowing from west to east with a speed of 18 km/h. A boat, moving with speed of 36 km/h in still water, is made to travel one-round trip (bank to bank of the river). Minimum time taken by the boat for its journey and also the displacement along the river bank are ______ and ______ respectively. [2026]

Smart Achievers · Accepted Answer

(3)

$Minimum time :$

$t_{\min} = \frac{200}{10} = 20 sec$

$For round trip = 40 sec$

$Displacement along river bank = 40 \times 5 = 200 m$

Solution

1 20 s and 100 m

2 40 s and 0 m

3 40 s and 200 m

4 40 s and 100 m

Ans.
(3)

$Minimum time :$

$t_{\min} = \frac{200}{10} = 20 sec$

$For round trip = 40 sec$

$Displacement along river bank = 40 \times 5 = 200 m$

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