Question

A water pipe can fill a 500 litre tank in 2 hours qnd 30 minutes .in how much time will it fill 7/10 of the tank

Answer 1

Time taken to fill 500 l tank = 2hr 30min=2.5hr=5/2hr

Now,

7/10 of tank=7/10×500=350litre

Therefore applying unitary method,

→500 litre can be filled in 5/2 hr

→1litre can be filled in 5/(2×500) hr

→350 litre can be filled in (5×350)/(2×500)

=1750/1000=1.75 hr = 1 hr 45 min.

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Answer 2

1 hour = 500 ÷ 2.5

= 200 l

= 7/10 × 150

= 105 mins

= 1 hour 45 mins