a train has speed of 60kmph for the first one hour and 40 kmph for the next half hour its average speed in kmph is
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speed of train for 1 hr.=60kmph
distance =speed×time
distance =60×1=60km
now...
next 0.5hrat speed of 40kmph
distance covered in 0.5 hr at the speed of 40kmph=20km
so
total distance covered by train =80 km
total time taken=1.5hr
average speed of train =total distance /total time
speed=80/1.5=53.4kmph
distance =speed×time
distance =60×1=60km
now...
next 0.5hrat speed of 40kmph
distance covered in 0.5 hr at the speed of 40kmph=20km
so
total distance covered by train =80 km
total time taken=1.5hr
average speed of train =total distance /total time
speed=80/1.5=53.4kmph
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