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

How many 3-digit codes using the digits 0 through 9 are possible if repetitions are allowed. Is it 504, 729, 30, 1000. Can you show me how to work this out?

Thank you,

Ellen
i need help in these two problems..can someone explain them to me thanks

problem #1
find the future value of the ordinary annuity.
If R = $2,500, I = 5% interest compounded qu