book Maths Puzzle Numerical Ability

Solve this problem:

Jill is 22.5 kilometers away from Joe. Both begin to walk toward each other at the same time. Jill walks at 1.5 km/hr. They meet in 5 hours. How fast is Joe walking?

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book Other Question
I'm not sure how to get the square root of 16b^4
Could you help me? thanks! Simplify: y to the 4th power times y to the -2nd power. What are the steps you take to solve?