The train is 100 meters long and it takes 30 seconds to cross a 400m bridge. What speed is the train going at?
Answers
Answered by
5
speed = distance/time
= 400+100/30
=50/3 m/s
= 400+100/30
=50/3 m/s
Answered by
6
Speed = Distance /Time
Distance = Length of train + Length of bridge
= 100m + 400m
= 500m
Time = 30 seconds
NOTE that the standard unit of speed is "kilometre and hrs"
So, we will convert 30 seconds into hrs
30/60×60 = 3/120 hrs
= 1/40 hrs
AND
500/1000km
= 1/2 km
Let's solve it now
Speed = Distance /Time
= (1/2)/(1/40)
= (1/2)×(40/1)
=20 km/hr
Distance = Length of train + Length of bridge
= 100m + 400m
= 500m
Time = 30 seconds
NOTE that the standard unit of speed is "kilometre and hrs"
So, we will convert 30 seconds into hrs
30/60×60 = 3/120 hrs
= 1/40 hrs
AND
500/1000km
= 1/2 km
Let's solve it now
Speed = Distance /Time
= (1/2)/(1/40)
= (1/2)×(40/1)
=20 km/hr
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