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Question
Two points A and B are situated 60 km apart on a straight road. A vehicle travels from A to B in 3 h. It then halts for 1 h and takes 2 h to come back from B to A. Find the average speed of the whole journey.
Two points A and B are situated 60 km apart on a straight road. A vehicle travels from A to B in 3 h. It then halts for 1 h and takes 2 h to come back from B to A. Find the average speed of the whole journey.
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Solution
The correct option is B 20 km/h
Recall the following formula:
Average Speed = Total distance travelledTotal time taken
We need to find the average speed for the complete journey.
- Let us calculate the total distance travelled during the whole journey.
Distance from A to B = 60 km
Distance from B to A = 60 km
Total distance travelled
= 60 km + 60 km = 120 km
- Let us calculate the total time taken to complete the whole journey.
Time taken from A to B = 3 h
Time taken while halting = 1 h
Time taken from B to A = 2 h
Total time taken
= (3 + 1 + 2) h = 6 h
- Thus, average speed of the journey = 120 km6 h = 20 km/h
Recall the following formula:
Average Speed = Total distance travelledTotal time taken
We need to find the average speed for the complete journey.
- Let us calculate the total distance travelled during the whole journey.
Distance from A to B = 60 km
Distance from B to A = 60 km
Total distance travelled
= 60 km + 60 km = 120 km
- Let us calculate the total time taken to complete the whole journey.
Time taken from A to B = 3 h
Time taken while halting = 1 h
Time taken from B to A = 2 h
Total time taken
= (3 + 1 + 2) h = 6 h
- Thus, average speed of the journey = 120 km6 h = 20 km/h
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