Physics
posted by John .
An odometer in a car has a reading of 50 km at the beginning of a trip and a reading of 125 km half an hour later. What is the average speed of the car?
Textbook ans: 150km/h
Please can someone help me solve this problem? I don't know how to solve it. Can you show me steps (formula).
Thanks.

distance = 12550 = 75 km
time = 0.5 hr
distance/time = 75 km / .5 hr = 150 km/hr