The ratio of the speed of a boat in still water to its speed upstream is 4 : 3 4 : 3 4 : 3 . The boat covers 560 km 560 \text{ km} 560 km downstream i...

Question

The ratio of the speed of a boat in still water to its speed upstream is 4:34 : 3. The boat covers 560 km560 \text{ km} downstream in $7$ hours. What is the time taken by the boat to cover 480 km480 \text{ km} upstream?

Options

A.

8 hours8 \text{ hours}

B.

9 hours9 \text{ hours}

C.

7 hours7 \text{ hours}

D.

5 hours5 \text{ hours}

E.

10 hours10 \text{ hours}

boat and streamspeedratiotime calculation

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