SOLUTION: A driver drove at 80 kph for 20 minutes of a one -hour trip. His average speed for the whole trip is 75 kph. What was his average speed for the other 40 minutes of the trip

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Question 923113: A driver drove at 80 kph for 20 minutes of a one -hour trip. His average speed for the whole trip is 75 kph. What was his average speed for the other 40 minutes of the trip
Found 2 solutions by srinivas.g, MathTherapy:
Answer by srinivas.g(540) About Me  (Show Source):
You can put this solution on YOUR website!
Average speed for the whole trip = 75 kph
total journey time for whole trip = 1 hr
Distance covered in whole trip = speed *time
= 75*1
= 75 km
Distance covered in first 20 minutes with speed 80 kph = 80%2A%2820%2F60%29
=80%2A%281%2F3%29
=80%2F3
=26.67 km
Remaining distance to be covered = 75-26.67
= 48.33 km
remaining time = 1 hr -20 min = 40 min
=40%2F60 hr
=2%2F3 hr
average speed to be maintained = distance+%2Ftime
=26.67%2F%282%2F3%29
=26.67%2A%283%2F2%29
=40 Kph
Result is 40 kph

Answer by MathTherapy(10549) About Me  (Show Source):
You can put this solution on YOUR website!

A driver drove at 80 kph for 20 minutes of a one -hour trip. His average speed for the whole trip is 75 kph. What was his average speed for the other 40 minutes of the trip


Speed on 2nd leg of trip: highlight_green%2872.5%29 km/h

You can do the check!! 

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