Question

A train travels 40 kilometre at a uniform speed of 30 km per hour its average speed after travelling another kilometre is 45 kilometre per hour for the whole journey what is it's speed in the second half of the journey ​

Answer 1

Answer:

Explanation:.

Total distance =80km.

Average speed =45km/hr

Time taken in first half = 40/30 he

Second half speed =a

Time taken in second half = 40/a

Average speed =80/{(40/30)+(40/a)=45

a=90

Answer 2

Answer:

Explanation:

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