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UPSC 2014 CDS II Math Paper

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Question : 33

Total: 100

A man rides one-third of the distance from A to B at the rate of x km/hr and the remainder at the rate of 2y km/hr. If he had travelled at a uniform rate of 6z km/hr, he could have ridden from A to B and back again in the same time. Which one of the following is correct?

z=x+y
3z=x+y
1
z
=
1
x
+
1
y
1
2z
=
1
x
+
1
y

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