P is twice as fast as Q and R together .Working together ,all three can do a work in 21 days.In how many days can Q and R together do the work
Answer (1)
14th Jan, 2020
Hello,
Let, the work done by P be p
and the work done by Q and R together be x
So, from first condition, p = 2x
All three can do work in 21 days.
So, 21 [ ( 1 / 2x ) + ( 1 / x ) ] = 1
So, 21 ( 3x / 2 x^2 ) = 1
So, 2x = 3 x 21
So, x = 63 / 2
So, x = 31.5 days.
So, Q and R can do the work together in 31.5 days
Best Wishes.
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