Multiple choice

A man rows 40 km upstream in 8 hours and a distance of 36 km downstream in 6 hours. Then speed of the stream is एक व्यक्ति 40 किमी. की दूरी ऊर्ध्वप्रवाह 8 घंटे में तय करता है और एक 36 किमी. की दूरी 6 घंटे में तय करता है |धारा की चाल है |

  1. 0.5 km/hr. / किमी / घंटा

  2. 1.5 km/hr. / किमी / घंटा

  3. 1 km/hr. / किमी / घंटा

  4. 3 km/hr. / किमी / घंटा
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A Correct answer
Explanation

Speed upstream = 40/8 = 5 km/h (boat speed - stream speed). Speed downstream = 36/6 = 6 km/h (boat speed + stream speed). Let boat speed = b, stream speed = s. Then b - s = 5 and b + s = 6. Adding: 2b = 11, so b = 5.5 km/h. Therefore s = 6 - 5.5 = 0.5 km/h.

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