Question
Resham travels 60 km at 20 km/h by cycle, 120 km at 60
km/h by car, and the remaining 10 km on foot at 2.5 km/h. Find her average speed for the whole journey. (Rounded off to 2 decimal places)Solution
Total Distance = 60 km + 120 km 10 km =190 km  Time taken by cycle = 60 km/20 km/h = 3 hours  Time taken by car = 120 km/60 km/h = 2 hours  Time taken on foot = 10 km/2.5 km/h = 4 hours  Total Time =3+2+4= 9 hours  Average Speed = 190 km/9 hours = 21.11 km/h
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