Find Total Distance

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A trucker drove for 4 hours at an average speed of 60 miles per hour (mph) and then for 3 hours at an average speed of 30 mph. What was his total distance traveled?

Let D_1 = first distance.

Let D_2 = second distance

D_1 = 4(60)

D_1 = 240 miles.

D_2 = 3(30)

D_2 = 90 miles.

Let D_1 + D_2 = total distance

D_1 + D_2 = 240 miles + 90 miles

D_1 + D_2 = 330 miles.

The truck driver drove a total distance of 330 miles.
 

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