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Q.
A boat travels 72 km downstream in 8 hours and 84 km upstream in 12 hours. Find the speed of the boat in still water and the speed of the water current ?
A.
9 and 3 kmph
B.
6 and 7 kmph
C.
8 and 1 kmph
D.
7 and 2 kmph
View Answer
Correct choice: C
Explanation:
Downstream speed = 72km/8hrs = 9 kmph upstream speed = 84km/12hrs = 7 kmph speed of boat = avg of downstream and upstream speeds speed of boat = (9+7)/2kmph = 8 kmph. current speed = half of the difference of downstream and upstream speeds currend speed = (9-7)/2kmph = 1 kmph
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