Here is the last rate problem in my General Knowledge test:

A bicycle racer covers a 75 mile training route to prepare for an upcoming race. If the racer could increase his speed by 5mph. he could complete the course in three fourths of the time. Find his average speed.

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0 75

Average speed of bicycler= x

x+5mph/3/4h= 75miles

well the answer is 15 mph

I still can t set up an equation right please help.

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