3. A boat travels from point M to point N downstream and returns from N to M upstream. The distance between M and N is 60 km. If the round trip takes 12 hours and the speed of the boat in still water is 12 km/hr more than the speed of the stream, then find the time taken for the downstream journey.
Answers
Answer:
3 hours will be the answer
Given : A boat travels from point M to point N downstream and returns from N to M upstream.
The distance between M and N is 60 km.
the round trip takes 12 hours and
the speed of the boat in still water is 12 km/hr more than the speed of the stream,
To find : the time taken for the downstream journey.
Solution:
Speed of stream = x km/hr
speed of the boat in still water is 12 km/hr more than the speed of the stream,
Speed of boat in Still water = x + 12 km /hr
Down stream speed = x + 12 + x = 2x + 12 km/hr
upstream speed = x + 12 - x = 12 km/hr
Time Taken in upstream = 60/12 = 5 hr
Total time taken = 12 hrs
Time taken in Down stream = 12 - 5 = 7hrs
There is mistake in Data as Downstream time should be less than upstream time
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