exam Maths Puzzle Numerical Ability

Ride the peaks. Smith bicycled 45 miles going east from Durango, and Jones bicycled 70 miles. Jones averaged 5 miles per hour more than Smith, and his trip took one half hour longer than Smith’s. How fast was each one traveling.

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exam Other Question
In order to plot the graphs of the following functions, what do I do first? I am so lost!
f(x)=7^x
f(x)=4^x-3
f(x)=(1/5)^x
f(x)=log3x

Thanks for your help! Find the square root. Assume that all of the variables represent positive real numbers of the radical

/(9/4)