(c) A car moves with a speed of 40 km/h for 15 minutes and then with a speed of 60 km/h for the next 15
minutes. What is the total distance covered by the car. Also find its average speed during the journey.
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Answer:
Speed of car in first 15 minutes = 40 km/h
Distance covered = speed × Time taken
60 minutes = 1 hour
15 minutes = 60/15 hour
Distance covered = 240×60/15
=10km
Speed of car in next 15 minutes = 60 km/h
Distance covered = 60× 60/15
=15km
∴ Total distance covered = (10+15)km = 25 km
∴ 25 km is correct...
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