**A rectangular tank 2.5 m long and 1.2 m wide is filled with water from two taps. Tap A fills it with water at the rate of 12 litres per minute and Tap B fills it up with water at the rate of 15 litres per minute. Both taps are turned on at the same time. What is the height of the water in the tank after 8 minutes?Solution**

Tap A ----- 12 litres per min

Tap B ----- 15 litres per min

Total ----- 27 litres per min

1 min ----- 27 litres

8 min ----- 8 x 27 litres = 216 litres or 216 000 cubic cm

Volume = Length x breadth x height

216 000 cubic cm = 250 cm x 120 cm x height

height = 216 000 cubic cm divided by (250 x 120) square cm

height =

**7.2 cm (Answer)**