Question

P and Q can finish a work in 6 days. Q and R can finish the same work in 60/7 days working together whereas R and Pcan finish the same work in 20/3 days working together. in how much time, can P,Q,R finish the same work if all of them work together​

Answer 1

Step-by-step explanation:

take LCM for days to set total work = 60

p+q= 6 ==10 capacity/day

q+r = 60/7==7 capacity/day

r+p = 20/3==9capacity/day

2(p+q+r) = 26

p+q+r = 13

working together ,

time = 60/13 = 4 ⁸/13days