A man can row 8km in one hour in still water. If the speed of the water current is 2 km/hr and it takes 3 hours for him to a new place and return, find the distance from the starting point to the new place.
Answers
Given : A man can row 8km in one hour in still water.
Speed of the water current is 2 km/hr and it takes 3 hours for him to a new place and return,
To find : the distance from the starting point to the new place.
Solution:
A man can row 8km in one hour in still water.
Speed in still water = 8 km/hr
Speed of stream = 2 km/hr
Upstream speed = 8 - 2 = 6 km/hr
Down stream speed = 8 + 2 = 10 km/hr
Distance of one side = d km
Total Time taken = d/6 + d/10
= ( 5 + 3)d/30
= 8d/30
8d/30 = 3
=> d = 90/8
=> d = 11.25 km
the distance from the starting point to the new place. = 11.25 km
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