exam Maths Puzzle Numerical Ability

A car travels 100 mph for the first half of a 400 mile race. How fast must the car go to average 200 mph?

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exam Other Question
{[7(x-2) + 4] - [2(x-5)+6}] Jo read 50 pages of a novel in 4 hours.At the same rate, how long would it take Jo to read 400 pages?