A car can average 20km per hour up a hill and 60 km per hour down the same road what is the average speed fir the whole trip
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Let Distance Ne=x km
Speed=20 km/h
Time=Distance/speed
Time=x/20 hour
Speed=60km/h
Time=x/60 hour
AVERAGe Speed=Total Distance/Total Time
Total Distance=x+x=2x km
Total Time=x/20+x/60=4x/60 hour
2x/4x×60
=30 km/h
Average speed=30 km/h
Speed=20 km/h
Time=Distance/speed
Time=x/20 hour
Speed=60km/h
Time=x/60 hour
AVERAGe Speed=Total Distance/Total Time
Total Distance=x+x=2x km
Total Time=x/20+x/60=4x/60 hour
2x/4x×60
=30 km/h
Average speed=30 km/h
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