a train travels 30 km with speed of 15 km/hr and next 30 km with speed of 30 km/ hr . calculate average speed.
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▪︎Given:-
- Distance covered by train at the speed of 15km/h = 30 km
- Distance covered by train at the speed of 30km/h = 30 km
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▪︎To Find:-
- Average speed of train during whole journey?
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▪︎Formula Used:-
- Time = Distance ÷ Speed
- Average speed = Total distance ÷ Total time
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▪︎Solution:-
➢ Time taken by train to cover the distance of 30 km at the speed of 15km/h ;
Distance ÷ Speed
= 30 ÷ 15
= 2h
➢ Time taken by train to cover the distance of 30 km at the speed of 30km/h ;
Distance ÷ Speed
= 30 ÷ 30
= 1h
➢ Total distance covered by train in whole journey
= 30 + 30
= 60 km
➢ Total time taken by train in whole journey
= 2 + 1
= 3h
➢ Average speed of train during whole journey
= Total distance ÷ Total time
= 60 ÷ 3
= 20 km/h
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▪︎Answer:-
Average speed of train during whole journey is 20 km/h.
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