1. Dina walks 400 meters from her house to a convenience store in 5 minutes. What is her average speed?
2. A motorist drives 100 km from Quezon city to Clark in 1.5 h but makes the return Trip in only 1 h. What is the average speed of the motorist for (a) each half of the trip and for (b) the total trip?
2. A motorist drives 100 km from Quezon city to Clark in 1.5 h but makes the return Trip in only 1 h. What is the average speed of the motorist for (a) each half of the trip and for (b) the total trip?
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Answer:
1.) 80 m/m (meters per minute)
2.) 1st half = 66.667 km/h (kilometers per hour)
2nd half = 100 km/h (kilometers per hour)
total trip = 80 km/h (kilometers per hour)
Explanation:
To get the average speed, you need to divide the distance traveled by the time taken.
So for number 1, you divide 400 meters by 5, you will get 80 meters per minute.
For number 2, you divide 100 kilometers by 1.5, which gets you 66.667 kilometers per hour for half of the trip, for the other half, you divide 100 by 1, which gets you 100 kilometers per hour.
To get the average speed for the total trip, you double the distance and add the time taken for both halves of the trip, which gets you 200 kilometers and 2.5 hours, now divide 200 kilometers by 2.5 and you get 80 kilometers per hour.