SOLUTION: A car and bus leave at the same time and travel to the same place. The car travels 21 mph faster than the bus and gets there in four hours. The bus gets there two hours later. Find

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Question 529922: A car and bus leave at the same time and travel to the same place. The car travels 21 mph faster than the bus and gets there in four hours. The bus gets there two hours later. Find the speed of the bus and car.
Answer by boilpoil(127) About Me  (Show Source):
You can put this solution on YOUR website!
We could try using algebra:
Let the speed of car be x
Then the speed of bus is x-21
4x=6%28x-21%29 ---The speed of the car is x, it traveled 4 hours, so 4x represents the total distance, the bus uses 6 hours with a speed of x-21 so it also represents the distance
4x=6x-126
-2x=-126
x=63%28mph%29
The speed of bus
=63-21
=42(mph)