Question

This sand timer contains 595 g of sand.

It takes half an hour for all of the sand to flow through the timer.
Each millilitre of sand weighs 1.6 g.
How many millilitres of sand flow through the timer per minute?

12.4
19.8
31.7
743.8

Answer 1

The first answer

12.4

Answer 2

595g ÷ 30mins = 19.8g per min

19.8g per min ÷ 1.6g each mil

= 12.374mil per min rounded

= 12.4mil per min