A tap can fill a oil tank in 15 hours. After half the oil tank is filled, nine more similar taps are opened. What is the total time taken to fill the oil tank completely? Plz give step by step solution in easy way.
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Given : Time taken to fill one tank by a tap - 15 hrs
Half tank filled in - 7.5 hrs = 7 hrs 30 mins
Part remaining = 1/2 tank
Time required for 10 taps = 10*1/15 = 10/15 hrs
10/15 : 1/2 = 1 : X
∴ X = 1/2 *1*15/10 = 3/4 hrs = 45 mins
Total time taken = 7 hrs 30 mins + 45 mins = 8 hr 15 mins
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