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Question

Q. A fisherman rows 7500 m in 6750 seconds against the stream and returns in 75 minutes. Find the speed of the stream.

Q. एक मछुआरे को धारा के विपरीत 7500 मीटर नौकायन करने में 6750 सेकंड और वापस लौटने में 75 मिनट लगते हैं। धारा की गति ज्ञात कीजिए।

A

1 km/h
1 किमी / घंटा
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B

3km/h
3 किमी / घंटा
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C

5 km/h
5 किमी / घंटा
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D

7 km/h
7 किमी / घंटा
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Solution

The correct option is A
1 km/h
1 किमी / घंटा
Let the speed of the boat be = x km/h
Let the speed of the stream be = y km/h
Speed of the boat against the stream will be = (x - y) km/h
= (75006750)×185 = 4 km/h ---(1)
Speed of the boat in the direction of the stream will be = (x + y) km/h
= 750075×60×185 = 6 km/h ---(2)
(1)+(2) → 2x = 10 km/h
Which means the speed of the stream = y = 1 km/hr


माना कि नौका की चाल = x km/h
माना कि धारा की चाल = y km/h
धारा के विपरीत नौका की चाल = (x - y) km/h
= 750075×60×185 = 4 km/h ---(1)
धारा के साथ नौका की चाल = (x + y) km/h
= 750075×60×185 = 6 km/h ---(2)
(1)+(2) → 2x = 10 km/h
अतः धारा की चाल = y = 1 km/hr

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