At 8am a truck travelling at 60km/h was 3 km behind a bus. At 8:45am, the truck was 12km ahead of the bus. find the speed of the bus(in kmph)

• the speed of the bus is 40kmph
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• 60(3/4)-x(3/4)=15
  x=40 kmh
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• truck travelling at 60..travels a distance of 45 kms in 45 mins
  that means in this 45 it should contain 3 kms lag and 12 kms lead=45-(15)=30
  in this 45 mins bus covered a distance of 30 kms..then speed of bus is (60*30)/45=40 kmph
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