At the start of a trip, a car's speedometer reads 54, 247 km, while at the end it reads 55, 227 km. If the trip took 8 hours, what was the car's average speed?

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This problem is very simple. The average speed would be (end mileage-start mileage)/t, where t the total time your trip took.

As kcomissiong mentioned, the formula for finding an average velocity (speed) is the total distance traveled divided by the time it took.

Make sure you watch your units though. If the answer requires meters per second (m/s) instead of kilometers per hour, then you will need to do some converting.