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A driver traveled from city A to city B in hour and 13 minutes. On the way, he had to stop at 5 traffic signals, with an average time of 80

seconds. If the distance between the cities is 65 kilometers then what was the average driving speed?

User MilapTank
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Answer:approximately 58.76 kilometers per hour.

Explanation:

The driver traveled from city A to city B in 1 hour and 13 minutes, which is a total of 73 minutes. During this time, he had to stop at 5 traffic signals, with an average time of 80 seconds per signal. Therefore, the total time the driver spent waiting at traffic signals is:

5 signals x 80 seconds per signal = 400 seconds

To calculate the total time the driver spent driving, we need to subtract the time spent waiting at traffic signals from the total time of the trip:

Total driving time = Total trip time - Time spent waiting at signals

= 73 minutes x 60 seconds per minute - 400 seconds

= 4380 seconds - 400 seconds

= 3980 seconds

Now we can calculate the average driving speed:

Average speed = Distance / Time

Since the distance between the cities is 65 kilometers and the time spent driving is 3980 seconds (or 1.106 hours), we have:

Average speed = 65 km / 1.106 hours = 58.76 km/h

Therefore, the average driving speed was approximately 58.76 kilometers per hour.

User Adrian McCarthy
by
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