A. 30 km/hr

B. 40 km/hr

C. 45 km/hr

D. 55 km/hr

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45 km/hr

ridge Length of Bridge = 1 km =1000m

Length of train = half of Bridge = 1000/2 = 500m

total Distance Cover by the train = 1000 + 500 = 1500m

length of train = (1500*3600) / (120 * 1000) = 45 km/h

45

LENGTH OF BRIDGE = 1KM = 1000 M

LENGTH OF TRAIN = LENGTH OF BRIDGE/2 = 500 M

TOTAL DISTANCE = 1000 + 500 = 1500 M

IF TRAIN CROSS THE 1500 M IN 2 MINUTES

SPEED OF TRAIN = 1500 * 60/2

45000 M

45 KM

30km/hr

S=(length of the train+/length of the bridge)/time

length of the train = length of the bridge/2 = 1km = 1000/2

time = 2 m = 2*60 = 120 s

S=(1500/120)*(18/5)=45 km/h

45

45km/h

45km/hr

45KM

formula

x m/s=x*(18/5) km/hr

1500/120=12.5

speed= 12.5*(18/5)

45

man saw a train when it has already covered half distance of the bridge so remaining distance of the bridge is 0.5km

The length of the train is half of the bridge = 0.5km

so total distance = 0.5+0.5=1KM

total time is 2min

so speed= 1/(2/60) = 30KM/Hr

d = 1000 + 500 (distance to drive in meter. bridge + train size)

t = 120 (2 minutes to second)

s = d / t (12.5 m/s)

convert m/s to km/h = x 3.6

12.5 x 3.6 = 45 km/h

the train drive 45 km/h

30km/hr

because train passed 1km total distance starting bridge to ending take total time is 2 minitues

so that=1/0.033=30.30

Total distance= 1km+0.5 km=1.5km=1500m

Time taken =2min=120seconds

Speed=distance/time=1500/120=12.5m/s

Speed( in km/hr)=12.5*18/5=45

Correct option is

B

∴ Speed of the train=45 km/hr

In two minutes trains travels 1km

In one minute it will travels0.5km

1 hour = 60 minutes

Therefore it’s speed per hour is 0.5*60

i.e 30 km/h

45.45 km/hr approx 45km/hr

Total distance covered by train = 1km + 0.5km =1.5km

Time is 2minutes, this convert to hour is 2/60 = 0.033

speed =distance/time

1.5/0.033

= 45.45km/hr

Total distance=1+(1/2)=3/2

Time in hours=60/2

Speed of train=3/2×(60/2)=45km/hr

45km/hr

45km