Question

A train 360 m long is running at a speed of 60 km / hr . what time will it take to cross a bridge 140 m long​

Answer 1

Explanation:

Speed = 45 Km/hr = 45*(5/18) m/sec
= 25/2 m/sec
Total distance = 360+140 = 500 meter
Time = Distance/speed
= 500*\frac{2}{25} = 40 seconds

Answer 2

Answer:

$\bigstar{\bold{Time\:taken\:=\:30\:s}}$

Step-by-step explanation:

$\Large{\underline{\underline{\bf{Given:}}}}$

• Speed of the train = 60 km/hr = 16.67 m/s
• Distance travelled = Length of train + Length of bridge = 360 +  140 = 500 m

$\Large{\underline{\underline{\bf{To\:Find:}}}}$

• Time taken to cross the bridge

$\Large{\underline{\underline{\bf{Solution:}}}}$

→ Time taken is given by the formula

   Time = Distance / Speed

→ Substituting the given datas we get

  Time = 500/16.67

  Time = 30 s

$\boxed{\bold{Time\:taken\:=\:30\:s}}$

$\Large{\underline{\underline{\bf{Notes:}}}}$

→ Speed is defined as the distance travelled per unit time. It's unit is m/s.

→ Speed is a scalar quantity.

→ Speed = Distance travelled/ Time taken