Volume P6 CHIJ 2011 SA2 P2 Q18

Volume P6 2010 SA2 CHIJ P2 Q12

The base of an empty tank measures 64 cm by 25 cm. It was being filled with water from Tap A and Tap B at a rate of 4 litres per minute and 10 litres per minute respectively. Both taps were turned on at the same time and they took 8 minutes to fill up the tank completely. (a) What was the height of the tank? (b) How much longer would it take if Tap A alone is used to fill up the empty tank? [4 marks][Answer given: 70 cm, 20 min]


4 + 10 = 14 litres/min

14 x 8 = 112 litres

112 x 1000 / (64 x 25) = 70 cm

a) It was 70 cm.


112/4 = 28

28 - 8 = 20 min

b) It was 20 min longer.