Question

4 pipes can fill a tank in 70 mins
How much time will tank take to fill if 7 pipes are used

Answer 1

Let the time taken be x.
4pipes=70min.
7pipes=x7pipes=x.

Inverse proportion

=> 4×10=7×x4×10=7×x
4×7074×707=x=x
x=40 mins.

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Answer 2

4 pipes can fill a tank = 70 minutes
1 " 1 min " " = 1/70 min
7 pipes can fill a tank =7 *1/70
" " " " " = 1/10
Complete timing of fill a pipe = 10/1 =10