Question
Sat May 26, 2012 By: Hebah Mehereen

on a 60 km track a train travels the first 30km at a uniform speed of 30km/hr how fast must the train travel the next 30 km so as to the average speed 40km/hr sor the entire trip?

Expert Reply
Tue May 29, 2012
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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