You have boasted to your friends that you can ride your bicycle at 30 kph (km per hour) over a 30 km race comprising two 15 km laps. However, when you finish the first lap, your coach tells you that your average speed so far is only 15 kph. How fast must you ride to bring your average speed up to 30 kph.?
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15 kph fast must ridet average age
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Explanation:
you should have gone at=30km/h for 15 laps of 30 km
so you were supposed to take only 1 hour to finish the race
you finished 1 lap with =15km/h
1 lap=2km
2km at 15km/h
time taken=2/15 hour=8mins
remaining time =52mins
distance to cover =14laps of 28 kms
speed required =28km/52mins
=28÷52×60km/hr
=32.3077km/hr
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