colakumarfanta wrote:A along with B can do 1 / 2 of the work in 60 minutes, B is four times faster than A, How long will A take to do rest of the work if it works alone?
A. 50 B. 75 C. 120 D. 150 E. 300
Let the rate for B = 4 units per hour and the rate for A = 1 unit per hour.
Thus, in 60 minutes, A and B produce 1+4 = 5 units.
Since this is 1/2 the work, the remaining amount of work = 5 units.
Time for A to complete the work = w/r = 5/1 = 5 hours.
The correct answer is
E.
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