After driving along at a certain speed for 5 hours, Rich realizes he could have covered the same distance in 3 hours if he had driven 20 mi/h faster. What is his current speed?

Let x be current speed.

Distance covered in 5 hours =5x

If he had driven 20 miles faster, speed =x+20

He would have covered in 3 hours

3(x+20)=5x

3x+60 =5x

60 =2x

2x=60

x=30

His current speed = 30 miles per hour

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