the speed of a boat in still water is 15 km/ he and the speed of a stream is 5km/HR find time taken by the boat to cover (I) 40 km/ HR upstream (ii) 36 km/ HR downstream
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Answer:
4 hours for upstream and 1.8 hours downstrea
Step-by-step explanation:
In case of upstream, effective sppeed= 15-5 = 10 kmph so time = distance/speed = 40/10 = 4 hours
In case of downstream effective speed= 15+5p = 20 so time is 36/20 = 1.8 hours
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