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kamal

· started a discussion

· 1 Months ago

option D is correct (Question: 186618.0 )

..

Question:

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 ?

Options:
A) z = x + y
B) 3z = x + y
C) \(\cfrac{1}{z}=\cfrac{1}{x}+\cfrac{1}{y}\)
D) \(\cfrac{1}{2z}=\cfrac{1}{x}+\cfrac{1}{y}\)
Solution:

Ans: (d) 


Knowledge Expert

· commented

· 1 Months ago

1/2z = 1/x+1/y is correct.....we resolved it......
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