If a diesel hose a can fill a car tank in 20 minutes and a diesel hose b can fill up the same tank in 15 minutes, how long will it take for the two hoses to fill the car tank together?
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Answer:
Both will take 8 minutes 30 seconds to fill the tank.
Step-by-step explanation:
Solving it by the LCM method-
Time taken by hose A= 20 minutes
Time taken by hose B= 15 minutes
Taking their LCM, we get 60 ( total work)
Work done in unit time by A= 60/20 = 3
Work done in unit time by B= 60/15= 4
Hence, if both work together, time required to complete it= Total work/Total efficiency
= 60/7 = 8.5 minutes or 8 minutes 30 seconds
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