A boat can travel with a speed of 13 km/hr in still water. If the speed of the stream is 4 km/hr, find the time taken by the boat to go 68 km downstream.
Answers:
Speed downstream = (13 + 4) km/hr = 17 km/hr.
A man's speed with the current is 15 km/hr and the speed of the current is 2.5 km/hr. The man's speed against the current is: Answers:
Man's rate in still water = (15  2.5) km/hr = 12.5 km/hr.
Man's rate against the current = (12.5  2.5) km/hr = 10 km/hr.
A boat running upstream takes 8 hours 48 minutes to cover a certain distance, while it takes 4 hours to cover the same distance running downstream. What is the ratio between the speed of the boat and speed of the water current respectively?
Answers:
Let the man's rate upstream be x kmph and that downstream be y kmph.
Then, distance covered upstream in 8 hrs 48 min = Distance covered downstream in 4 hrs.
= 8 : 3.

Saturday, August 11, 2018
Boat & Stream
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