BD Merit - Freelancing, BCS, Bank, Primary, Admission, NTRCA

1 . If a boat goes 7km upstream in 42 minutes and the speed of the stream is 3kmph,then the speed of the boat in still water is-

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Answer: Option C

Explanation:

Let, the speed of the boat in still water is x km/hr

the speed of stream in 3 km/hr

So, Upstrem speed of boat is ( x - 3) km/hr

According to question,

Upstrem speed of boat is = 7/42 km/mint

= (7×60)/42 km/hours = 10km/hours

So, x - 3 = 10

x = 10 + 3 = 13 km/hr

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