Question

Hello! Plz solve it

A 250 litre tank empties in 2 hour 30 minutes due to a leakage. How long will it take for 9/10 of the tank to drain?
Thanku​

Answer 1

250 litre drains in 2.5 hours

so, 1 litre drain in = 0.01 hours

9/10 of 250 = 225 litres

so, 9/10 litre will drain in = 225*0.01 = 2.25 hours = 2 hours 15 mins

Answer 2

250 litre tank empty in 2hours 30 minutes = (120+30=150)

1litre tank empty in =150 mins/250 litre

225 litre of tank empty in time = 150/250×225

=3/5×45

3/1×9

=250×9/10

now remove zero (0) from 250 and 10

=25×9=225 litre.