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Question
Study the graph given below of a person who started from his home and returned at the end of the day. Answer the questions that follow.
- At what time did the person start from his home?
- How much distance did he travel in the first four hours of his journey?
- What was he doing from 3 pm to 5 pm?
- What was the total distance travelled by him throughout the day?
- Calculate the distance covered by him in the first 8 hours of his journey.
- At what time did he cover 16 km of his journey?
- Calculate the average speed of the man from (a) A to B (b) B to C.
- At what time did he return home?
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Solution
Observing the graph carefully, we conclude that
- At 10 AM, the person start from his home.
- In first 4 h (i.e. till 2 PM), he travelled 16 km.
- He was taking rest from 3 PM to 5 PM.
- The total distance covered by the person throughout the day was 40 km, i.e. 20 km from A to S and then 20 km from C to D.
- The distance covered by him in the first 8 h i.e. from 10 AM to 6 PM was 24 km.
- He covered 16 km of his journey at 2 PM.
- The total distance covered from A to S = 20 km and the time taken to travel from A to B = 5 h
∴ Average speed of the man from A to B = `20/5` = 4 km/h and average speed from S to C = `0/2` = 0 km/h - He returned home at 10 PM.
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