Question

Jagan went to another town covering 240 km by car moving at 60 kmph. Then he covered 400km by train moving at 100 kmph and then rest 200 km he covered by a bus moving at 50 kmph. The average speed during the whole journey was ?

Answer 1

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Here is your answer.
By Car

Distance= 240 km
Speed= 60 km/ hr
so Time = 240/60.
= 4 hr

By Train,

Distance = 400 km
Speed = 100 km/hr
so Time = 400/100
= 4 hr

By Bus,
Distance = 200 km
Speed = 50 km/ hr
so Time = 200/50
= 4 hr

Now, for average speed we have to calculate

Total Distance = 240 + 400 + 200
= 840 km

Total Time = 4 + 4 +4
= 12 hr

Average Speed = $\frac{Total \:Distance}{Total \:Time}$
$= \frac{840}{12} \\ \\ = 70 \: km \: per \: hrs$
The average speed during the whole journey was 70 km / hrs.

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Answer 2

Distance= 240 km
Speed= 60 km/ hr
so Time = 240/60. 
= 4 hr

By Train,

Distance = 400 km
Speed = 100 km/hr
so Time = 400/100
= 4 hr

By Bus,
Distance = 200 km
Speed = 50 km/ hr
so Time = 200/50
= 4 hr

Now, for average speed we have to calculate

Total Distance = 240 + 400 + 200
= 840 km

Total Time = 4 + 4 +4
= 12 hr

Average Speed = distance / time
= 840 / 12 = 70
The average speed during the whole journey was 70 km / hrs.