8. A man can row 3/4 of a km against the stream in 45/4 minutes and returns in 7.5 minutes. Find the speed of the man in still water?
(a) 3 km/hr
(b) 4 km/hr
(c)5 km/hr
(d) 6 km/hr
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Answer:
option b is the answer because distance s= v-u
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