A boat covers a distance of 240 km 240 \text{ km} 240 km upstream and the same distance downstream in a total of $5$ hours. The ratio of the speed of ...

Question

A boat covers a distance of 240 km240 \text{ km} upstream and the same distance downstream in a total of $5$ hours. The ratio of the speed of the boat in still water to the speed of the stream is 5:35:3. Calculate the time taken by the boat to travel 640 km640 \text{ km} downstream.

Options

A.

$8$ hours

B.

$1$ hour

C.

$2$ hours

D.

1131\frac{1}{3} hours

E.

2232\frac{2}{3} hours

boat and streamspeedtimeratio

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