Sumit covered 20 km of in 30 minutes which was the first part of his journey, and the remaining part of 29 km in 40 minutes. His average speed in km/hr is:
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Average speed =
Total distance travelled /
Total time taken
Therefore ,
20 + 29/ (40 +30 / 60) hours
49/ (7/6)
42 km / hr.
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