Question

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

Answer 1

solution :

9/10 of 250 = 225 ltrs

250 lts empties in 2.5 hrs = 100 ltrs / hr

so to empty 225 liters it would take 2.25 hours  i.e 2 hours 15 mins

so it would empty 9/10 of tank in 2 hrs 15 mins

hope that helps !!!