Q20 of 40 Page 13

5 pipes are required to fill a petrol tank in 2 hour 20 minutes. How long will it take if only 4 pipes of the same type are used? 

 

Number of pies5 4
Time (in min)140x
175 minutes= 2 hrs 91 min = Number of hours required = 2 hrs 91 min.

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