Question

a train 100 M long and is moving with a constant velocity of 60 km per hour find the time it takes to cross the bridge 1 km long

Answer 1

total distance to travel= 100m + 1000m=1100m
now 60km/h = 60000/3600 m/s =50/3 m/s
time= 1100÷ 50/3 seconds
=1100×3/50 s
= 66 seconds or 1 min 6 seconds

hope it helps

Answer 2

✬ Time taken = 66 seconds ✬

Explanation:

Given:

• Length of train is 100 m.
• Train is moving with velocity (v) = 60 km/h

To Find:

• How much time will train took to cross 1 km long ?

Formula to be used:

• Time = Distance/Velocity

Solution: Let the time be t

Length of bridge is in km and length of train is in meter so we have to make the units same.

• 1 km = 1000 m { Length of bridge }

➯ Also, velocity is in km/h so we have change into m/s

• 60 x 5/18 m/s = 16.67 m/s

➼ Total distance (s) = Length of train + Length of bridge

➼ Total distance (s) = (100 + 1000) m = 1100 m

• Putting the values on Formula •

$\implies{\rm }$ t = s/v

$\implies{\rm }$ t = 1100/16.67

$\implies{\rm }$ t = 65.98 or 66 seconds

Hence, The train will cross the bridge in 66 seconds or in 1 minutes 6 seconds.