1.

A family goes on trip of total 3000 km in the following way ∶ 1200 km at 60 km / hr by train, 900 km at 45 km / hr car and remaining at 30 km / hr by bus. Find the average speed of entire journey?1. 45.562. 42.863. 56.234. 39.455. 79.80

Answer» Correct Answer - Option 2 : 42.86

Formula used

Average speed = \(\frac{{{\rm{Total\;distance\;}}}}{{{\rm{Total\;time\;}}}}\)

Calculation∶

Time taken while travelling by train = 1200 / 60 = 20 hrs

Time taken while travelling by car = 900 / 45 = 20 hrs

Time taken while travelling by bus = (3000 - 1200 - 900) / 30 = 30 hr

Total time taken = 20 + 20 + 30 = 70 hr

Average speed = (3000) / 70 = 42.86 km / hr


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