1.

4, On a 60 km track, a train travels the first 30 kmle30 km h. How fast must the trainwith a uniform speed of30 km h-1 . He next 30 km so as to average 40 km h for the-1entire trip?

Answer»

Let the train must travel with a speed of x km

Average speed = Total distance travelled\Total time taken

40 = 60/ x + 1

x + 1 = 1.5

c = 0.5 hr

Speed for the next 30 km = 30 /0.5 = 60 km/h



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