Tool By Zeal Point

Q. 5 taps fill 24 litres of water in 8 hours. How many hours will 15 taps take to fill 48 litres ?

A) 4 hours 40 minutes B) 5 hours 20 minutes C) 6 hours D) 6 hours 40 minutes

Here:
M = Number of taps
H = Time in hours
W = Water in litres

Using: $M 1 \times H 1 \times W 2 = M 2 \times H 2 \times W 1$

5 \times 8 \times 48 = 15 \times H \times 24

H = 5 \times 8 \times 48 / 15 x 24

H = 128/ 24 = 5 1/3 hours

13 hour = 20 minutes

Therefore,

H = 5 hours 20 minutes

Ans: B) 5 hours 20 minutes

========================================

Q. 6 taps fill 30 litres of water in 10 hours. How many hours will 15 taps take to fill 50 litres ?

A) 5 hours B) 6 hours C) 6 hours 40 minutes D) 7 hours

Formula: $H 2 = M 1 \timesH 1 \timesW 2 / M 2 \timesW 1$

$H 2 = 6 \times 10 \times 50 / 15 \times 30$

$H 2 = 3000/450 = 6 2/3 hours$ $= 2/3 hours = 40 minutes$

Ans: C) 6 hours 40 minutes

Trick: i. More taps → less time, ii. More water → more time