P,q,r can do work together in 20 days .A and b can do the same work at double the speed. If all of them work together in how many days will they finish 3/4th of the work?
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Answer:
5 days
Step-by-step explanation:
P,Q,R can do work in 1 day = 1/20
a,b can finish work in 10 days with double speed and can do work in 1 day = 1/10
Their work together in 1 day = 1/20 + 1/10 = 3/20
They can do full work in 20/3 days
So 3/4×1/x = 1×20/3
=)3/4x = 3/20
=)60 = 12x (by cross multiplication)
=)x= 60/12 = 5 days
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