Question

if 3/5th of water tank is filled in 3 minutes,how much more time be required to fill rest of tank?
2min
1.5min
4min
1min

Answer 1

3/5th of water tank - 3 minutes
Full water tank - $3$ × $\frac{5}{3}$ = 5 minutes.

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Answer 2

in 2 min 2/5 tank is filled
in1.5 min 0.3 tank is filled.
in 4 min 4/5 tank is filled.
in 1min i/5 tank is filled.