Question
Reshma travels 45 km at 15 km/h by cycle,80 km at 40
km/h by car, and the remaining 6km on foot at 2 km/h. Find his average speed for the whole journey. (Rounded off to 2 decimal places)Solution
Total Distance = 45 km +80 km +6 km =131km The time taken for each mode of transport is calculated using the formula: Time = Distance Speed  Time taken by cycle = 45 km /15 km/h = 3 hours  Time taken by car = 6 km /2 km/h= 3 hours  Time taken by foot= 80 km /40 km/h = 2 hours The total time taken is the sum of the time taken for each segment: Total Time = 3 hours + 2 hours + 3 hours =8 hours Average Speed = Total Distance /Total Time Average Speed = 131 km/ 8 hours = 16.38 km/h
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