Question
Download Solution PDFReshma covers 45 km at a speed of 15 km/h by bicycle, 80 km at a speed of 40 km/h by car, and another 6 km at a speed of 2 km/h on foot. Find her average speed for the whole journey (correct to 2 decimal places).
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFGiven:
Distance covered by bicycle = 45 km
Speed while bicycling = 15 km/h
Distance covered by car = 80 km
Speed while driving = 40 km/h
Distance covered on foot = 6 km
Speed while on foot = 2 km/h
Formula Used:
Average speed = Total distance travelled / Total time taken
Calculation:
Total distance = 45 km + 80 km + 6 km
Total distance = 131 km
Time taken while bicycling = 45 km / 15 km/h
Time taken while bicycling = 3 hours
Time taken while driving = 80 km / 40 km/h
Time taken while driving = 2 hours
Time taken on foot = 6 km / 2 km/h
Time taken on foot = 3 hours
Total time = 3 hours + 2 hours + 3 hours
Total time = 8 hours
Average speed = Total distance / Total time
Average speed = 131 km / 8 hours
⇒ Average speed = 16.375 km/h
Average speed (correct to 2 decimal places) = 16.38 km/h
The average speed for the whole journey is 16.38 km/h.
Last updated on Jul 1, 2025
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