book Maths Puzzle Numerical Ability

Can you please help me? I am really confused.

Bobby and Rick are in a 10-lap race on a one-mile oval track. Bobby, averaging 90 mph has completed two laps just as Rick is gettin

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book Other Question

Curly can do a job in 30 min, Larry can do it in 40 min, and Moe can do it in 60 min. How long will it take them if they work together? I cannot see to solve this one. Can someone help me out? Thanks!

Maya has deposited $600 in an account that pays 5.64% interest, compounded continuously. How long will it take for her money to double?