exam Maths Puzzle Numerical Ability

how do I rewrite the logarithm below as a single logarithm with a coefficient of 1?
2log_b x+5log_b y

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exam Other Question

Two cars leave at the same time from towns that are 180 miles apart traveling toward each other. One car travels 10 mph faster than the other. They meet each other after two hours. Find the speed of the faster car. Money and interest problem. Can anyone give me a hand? Thanks!

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