. A car starts from rest and travels for 30 minutes at 50
km/hr. It then stops for 10 minutes before continuing
its journey. It covers the last 25 km in 40 minutes.
Draw the distance-time graph for the journey and
answer the following questions :
(i) What is the total distance travelled?
(ii) What is the average speed for the whole journey?
Answers
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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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