A train travels 40 km with a uniform speed of 30 km/h.. it's average speed for the whole journey after covering another 40 km is 45 km/h .. what is it's speed in the second half of the journey??
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45km/h=40+40/ 40/30+40/x
45=80/4/3+40/x
45=80/4x+120/3x
45=80×3x/4x+120
45=240x/4x+120
45(4x+120)=240x
180x+5400=240x
5400=240x-180x
5400=60x
5400/60=x
90=x
speed for next half of journey =90km/h
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