Question

a pipe can fill 4 water tanks in 2 h 20 min.How long will it take to fill 7 such tanks using the same pipe

Answer 1

Convert 2h 20 mins into mins

2h 20 mins  = 140 mins

Find the time needed to fill 1 tank:

4 tanks = 140 mins

1 tank = 140 ÷ 4 = 35 mins

Find the time needed to fill 7 such tanks:

1 tank = 35 mins

7 tanks = 35 x 7 = 245 mins

Convert mins to hour and mins

245 mins = 4 hours 5 mins

Answer: It will take 4 hours 5 mins to fill up 7 such tanks.

Answer 2

use ratio and proportion