book Maths Puzzle Numerical Ability

Ruth had a 15-kilometer start on Nadia. How long will it take Nadia to catch Ruth if Ruth travels as 55 kilometers per hour and Nadia travels at 85 kilometers per hour?

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book Other Question

I need to Simplify and express in simplest radical form.

How would I simplify

3 square root of 8 + 2 square root of 16

would I get the same square root number of 16 on b I am stumpted on this problem. Can someone out there help me?

I need to find the rate:

240 ponds of fertilizer/6 lawns

Thank you!
Sher