A boat takes 90 minutes less to travel 36 miles downstream than to travel the same distance upstream. If the speed of the boat in still water is 10 metre/hour, the speed of the stream 1s

(a) 2 m/hr
(b) 2.5 m/hr
(c) 3 m/hr
(d) 4 m/hr

Ans . (a)

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