Two pipes p and q together can fill a cistern in 20 minutes and p alone can in 30 minutes then q alone can fill the cistern in
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Answer: q alone in 60 mins
Step-by-step explanation:
Pipe ''p and q'' in 20 mins == 1 tank
In 1 min == 1/20 of the tank
Pipe 'p' alone in 30 mins = 1 tank
In 1 min = 1/30 part
Let 'q' alone take 'x' mins.
In 1 minute = 1/x
1/20 = 1/30 + 1/x
1/20 - 1/30 = 1/x
30-20/600 = 1/x
10/600 = 1/x
x = 600/10 = 60 mins
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