Question

9. Jagan went to another town such that he covered 240 km by a car going at 60 km h-1
Then he covered 80 km by a train, going at 100 km h- and the rest 200 km, he covered
by a bus, going at 50 km h-1. What was his average speed during the whole journey?​

Answer 1

Answer:

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 = \begin{lgathered}\frac{Total \:Distance}{Total \:Time}\\\end{lgathered}

TotalTime

TotalDistance

\begin{lgathered}= \frac{840}{12} \\ \\ = 70 \: km \: per \: hrs\end{lgathered}

=

12

840

=70kmperhrs

The average speed during the whole journey was 70 km / hrs.

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Answer 2

your answer is 210 km h-1

60+100+50=210