exam Maths Puzzle Numerical Ability

A 2000L tank containing 550L of water is being filled with water at the rate of 75L per minute from a full 1600L tank. How long will it be before the two tanks have the same amount of water?

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exam Other Question
x^2-7x-30=0 The speeds of three cars are in the ratio 5:4:6.The ratio between the time taken by them to travel the same distance is
a)5:4:6 b)6:4:5 c)10:12:15 d)12:15:10