Question

three pumps working 8 hours a day can empty a tank in 2days .how many hours a day must 4 pumps work to empty the tank in 1 day?
a)13 hrs
b)12hrs
c)10hrs
d) 9 hrs​

Answer 1

Answer:

answer is b) 12 hours.

Step-by-step explanation:

Let the required number of working hours per day be x.

More pumps, Less working hours per day (Indirect Proportion)

Less days, More working hours per day (Indirect Proportion)

Pumps 4:3

Days1:2. }::8:x

∴4×1×x=3×2×8

⇒x=3×2×84

⇒x=12

hope it helps you....

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