Chain Rule Practice Test 1 with solutions

Question : 16 of 40

Marks: +1, -0

3 pumps, working 8 hours a day, can empty a tank in 2 days. How many hours a day must 4 pumps work to empty the tank in 1 day?

Solution:

Pumps	Days	Hours
3	2	8
4	1	x

⇒

x/8

2/1 × 3/4

∴ x =

{2×3}/{4} × 8

= 12 days

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