A train ,130 meters long travels at a speed of 45 km/hr crosses a bridge in 30 seconds.
A train ,130 meters long travels at a speed of 45 km/hr crosses a bridge in 30 seconds. The length of the bridge is
Answer/Solution
245 m
Steps/Work
length of the bridge = x meter
Total distance covered = 130+x meter
total time taken = 30s
speed = Total distance covered /total time taken = (130+x)/30 m/s
= 45 × (10/36) = (130+x)/30
= 45 × 10 × 30 /36 = 130+x
= 45 × 10 × 10 / 12 = 130+x
= 15 × 10 × 10 / 4 = 130+x
= 15 × 25 = 130+x = 375
= x = 375-130 =245
Total distance covered = 130+x meter
total time taken = 30s
speed = Total distance covered /total time taken = (130+x)/30 m/s
= 45 × (10/36) = (130+x)/30
= 45 × 10 × 30 /36 = 130+x
= 45 × 10 × 10 / 12 = 130+x
= 15 × 10 × 10 / 4 = 130+x
= 15 × 25 = 130+x = 375
= x = 375-130 =245