A boat takes 90 minutes less to travel 3...

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 mph; the speed of the stream is : `2m p h` b. `3\ m p h` c. `4\ m p h` d. `2. 5 m p h`

4 km/hr

3 km/hr

2.5 km/hr

2 km/hr

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