A train travels 40 km at a uniform speed of 30 km/h. It average speed after travelling 40 km is 45 km per hour for the whole journey. what will be speed in the second half of the journey.
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answer:
let the speed of the train in later half be x
Time taken to travel later 40 km= 40/x hours
total time taken
total distance = 45
average speed= total time
80 = 45
40 40
+
30 x
40x+1200= 80
X 30x
45
x= 90 kmph
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