Question

Q.39
+2.0,-0.0
If 10 pipes fill a tank in 2 hours 30
minutes, how much time will 15
pipes take to fill the same tank?
2 hours
o 3 hours 45 minutes
o 3 hours 30 minutes
0 1 hour 40 minutes​

Answer 1

10 pipes = 2 hours 30 minutes = 2.5 hours

15 pipes = x

inverse variation

$x_{1} : x_{2} :: y_{2} : y_{1}$

=> 10 : 15 :: x : 2.5

=> 15 x = 2.5 × 10

=> 15 x = 25

=> x = 25/15

=> x = 1.6

Therefore, the time taken for 15 pipes is 1.6 hours

Answer 2

Answer:

1hour =60minutes

2hours 30 minutes =150minutes

10 pipes fill the tank in 150 minutes

1 pipe fill the tank in 1500minutes

15 pipe fill the tank in 1500/15=100minutes

100minutes =1 hour 40 minutes