The speed of the boat in still water is 12 km/h. the speed of the stream is 2 km/h. A distance 8 km, going upstream, is covered in

1 hr

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1 hr 15 min

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1 hr 12 min

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None of these

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Solution

The correct option is D None of these
$t = \frac{D}{S_{B} - S_{S}} (u p s t r e a m) = \frac{8}{12 - 2} = \frac{8}{10} = \frac{8}{10} \times 60 = 48 m i n$

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