exam Maths Puzzle Numerical Ability

Mr.carlson drove a distance of 1000 miles to another city. He returned by plane. The eate of the plane was 10 times the rate at which he drove. He spent 22 hours on the trip. Find the rate at which he drove and the rate of the plane

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exam Other Question

Which of the following numbers is not the sum of three
consecutive integers?
Can someone help me on this problem?

I f(x) = 5x - 1, I need to find the following:
f(2r)

Thanks,
Sher