A man pushes downstream 30 km and upstream 18 km, taking 5 hours each time. What is the speed of the stream (current)? A) 1.2 KM/HR B) 1.7 KM/HR C) 2.8 KM/HR D) 4.8 KM/HR

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A man pushes downstream 30 km and upstream 18 km, taking 5 hours each time. What is the speed of the stream (current)?

A) 1.2 KM/HR
B) 1.7 KM/HR
C) 2.8 KM/HR
D) 4.8 KM/HR

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Answer: A 1.2 KM/HR
Solution:
Let x=speed of boat and y=speed of current
=30/ (x+y)=18/(x-y)=5 by solving y=1.2 km/hr