book Maths Puzzle Numerical Ability

OOPS...The last problem I submitted, 2/5w+10 - 3/2w-4

The correct answer is -11w-38/10(w+2)(w-2) Sorry!!

Please help!

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book Other Question

An investment of $1500 paid interest of $45 during a certain period. How much interest would an investment of $2000 invested at the same rate for the same length of time pay?

Thank you in advance!! a passenger trains speed is 60 mph and a frieght trains speed is 40 mph. The passenger train travels the same distance in 1.5 hours less time than the frieght train. How long does