1.

The train covered 8.7 km at the speed of 6 km/hr, stopped for 6 minutes and then covered 12.5 km at the speed of 5 km/hr. Find the average speed of train during the whole journey.1. 9.23 km/hr2. 5.23 km/hr3. 6 km/hr4. 10 km/hr

Answer» Correct Answer - Option 2 : 5.23 km/hr

Given:

The train covered 8.7 km at the speed of 6 km/hr, stopped for 6 minutes and then covered 12.5 km at the speed of 5 km/hr.

Concepts used:

Time = Distance/Speed

Average speed = Total distance/total time

Calculation:

Time taken by train to cover 8.7 km = 8.7/6 = 1.45 hours

Time taken by train to cover 12.5 km = 12.5/5 = 2.5 hours.

Stoppage time = 6 minutes = 6/60 hour = 0.1 hour

Total distance = 8.7 km + 12.5 km = 21.2 km

Total time = 1.45 + 0.1 + 2.5 = 4.05 hours

Average speed = Total distance/total time

Average speed = 21.2/4.05 = 5.23 km/hr

∴ Average speed of train is 5.23 km/hr.



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