Question 783295
A conveyor belt moves boxes of fruit at the rate of two tonnes in five minutes, while a second conveyor belt moves boxes of fruit at the rate of three tonnes in seven minutes. How many minutes will it take to move 20 tonnes of fruit using both conveyor belts?

Conveyor A = 2 tonnes in 5 minutes

it does 2/5 tonnes in 1 minute

Conveyor II = 3/7 tonnes in 1 minute

together they shift 2/5 + 3/7 tonnes in 1 minute

=(14+15)/35 in 1 minute

29/35 in 1 minute

20 in how many minutes

20 /(29/35)

24.1 minutes