Truck driver is 3 mph faster than the other after 2 hours and 210 miles apart.

Question

Two truck drivers leave a cafe at the same time, traveling in opposite directions. One truck goes 3 mph faster than the other one. After 2 hr, they are 210 miles apart. How fast is each truck going?

Answer 1

s represents the speed of the slower

s + 3 represents the speed of the faster

 

d = r · t

 

2s represents the distance of the slower

2(s + 3) represents the distance of the faster

 

2s + 2(s + 3) = 210

2s + 2s + 6 = 210

4s + 6 = 210

4s = 204

s = 51

 

The slower truck moves at 51 mpg and the faster at 54 mph.