exam Maths Puzzle Numerical Ability

A jet leaves at the average rate of 564 km/hr. A half hour later, another jet leaves at 744km/hr. How long will it be until the second jet overtakes the first?

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exam Other Question

Simplify squared root 7*squared root 14

I wish I had a scientific calculator to help me with these problems. A total of 28 bikes have 64 wheels. Some have 2 wheels and some have 3. How many have three wheels?