Question

Type the correct answer in the box.
Cindy runs 2 kilometers every morning. She takes 2 minutes for the first 250 meters, 4 minutes for the next 1,000 meters, 1 minute for the next 350 meters, and 3 minutes for the rest. Cindy’s average speed for the entire run is ___ meters per minute. One kilometer is the same as 1,000 meters.

Answer 1

The average speed for the entire run is 200 m/min.

Explanation:

We are given:

• Distance = 2 Km
• 1 km = 1000 m
• So distance in meters = 2000 m

Then let us calculate the total time taken by Cindy to cover these 2000 meters

Total time in minutes = 2 + 4 + 1 + 3 = 10 minute

Average speed = total distance  / total time

Average speed = 2000 m / 10 minutes

Average speed = 200 m / min

Thus the average speed for the entire run is 200 m/min.

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A boy runs for 10 min. at a uniform speed of 9 km/hr. At what speed should he run for the next 20 min. so that the average speed comes 12 km/hr?

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