Question

a water tank can be filled by 4 pipes in 1 hour and 30 min. How much time will it take if 15 pipes to fill the water tank​

Answer 1

Answer:

since,4 pipes can fill tank = 1 hrs 30 min or 90 min

therefore,1 pipe can fill it = 90 × 4 = 360 min

so, 15 pipe can do it in = 360/15 = 24 min answer