Arturo O. answered 03/24/20
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v = speed of car
v - 5 = speed of truck
time = distance / speed
Car:
t = 280/v
Truck:
t = 240/(v - 5)
The travel times are the same, so
280/v = 240/(v - 5)
Now solve for v, then get v-5. The final answer is
v = 35 mi/hr
v - 5 = 30 mi/hr
Test the answer.