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A train without stoppage travels at an average speed of 80 km/h and with stoppage it travels at 68 km/h. how many minutes does the train stop on an average per hour?
1. 10
2. 12
3. 15
4. 9

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Correct Answer - Option 4 : 9

Given:

The average speed of a train without stoppages is 80 km/hr

The average speed of a train with stoppages is 68 km/hr

Formula Used:

Distance = Speed × Time

Calculation:

Without stoppages, in 1 hr train covers 80 km.

With stoppages, in 1 hr train covers 68 km.

Thus, the average speed of the train is reduced by 80 - 68 = 12 km

So the time taken to cover 12 km is now actually used up at stoppages.

⇒ Time is taken to cover 12 km = \(\frac{{12}}{{80}} × 60\) minutes = 9 minutes

∴ The train stops for 9 minutes in an hour on average.

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