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Q.

A motorboat going downstream overcame a raft at position A. One hour later, the motor boat turns back and some times later crosses the raft at position C. The distance AC = 6 Km. The duty of the engine of motorboat remains constant. If the river flow velocity is x, find the value of x, in $\frac{k m}{h r}$ .

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Detailed Solution

$(v_{m} + v_{r}) 1 = (v_{m} - v_{r}) t + v_{r} (1 + t)$
t = 1
$∴ v_{r} (2) = 6 \frac{v_{d}}{E} = μ$
$v_{r} = 3 k m / h r$ $v_{d} = μ E$
$i = n e μ E$
$σ = n e μ$

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A motorboat going downstream overcame a raft at position A. One hour later, the motor boat turns back and some times later crosses the raft at position C. The distance AC = 6 Km. The duty of the engine of motorboat remains constant. If the river flow velocity is x, find the value of x, in kmhr .