exam Maths Puzzle Numerical Ability

I am trying to figure out how to understand what d equals in the following formula:

ts-tp=d/vs-d/vp

Any assitance would be great.

Thanks in advance,
Scott

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exam Other Question

Show that the numbers is rational by writing it as a quotient of two intergers.

4. 0.37

Any help with this equation would be <b>GREATLY</b> appreciated. Write each fraction in simplest form.
17/51

I never understood how to do these, help.