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A motor-boat, travelling at the same speed, can cover 25 km upstream and 39 km downstream in 8 hours. At the same speed, it can travel 35 km upstream and 52 km downstream in 11 hours. The speed of the stream is

A2 km/hr

B3 km/hr

C4 km/hr

D5 km/hr

Answer:

C. 4 km/hr

Read Explanation:

25 up+39 down = 8 hours. 35 up +52 down = 11 hours Solving 13 down-stream in 1 hours and 5 up-stream in 1 hour. Speed of stream 13-5/ 2 = 4km/hr


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ഒഴുക്കിനൊപ്പം ഒരു ബോട്ടിന്റെ വേഗം 13 കി. മീ. ആണ്. ഒഴുക്കിന്റെ വേഗം 2.5 കി. മീ. ആയാൽ ഒഴുക്കിനെതിരെ ബോട്ടിന്റെ വേഗം എന്ത് ?

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