5 pipes can fill a tank in 1 hour 38 minutes. How
long will 7 such pipes take to fill the tank?
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Step-by-step explanation:
time taken by 5 pipes to fill a tanka is 1h 38 min =98min so now 7 pipes is = x= (5*98)/7= 490/7 =70 so 70 min is 1h 16 min
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