Question

A 100 m long train is going at a speed of 60 km/hr. It will cross a 140 m long railway bridge in
1) 3.6 sec 2)7.2 sec 3) 14.4 sec 4)21.6 sec​

Answer 1

Hey Dearie!

$\bold \red{Mathematics \: is \: all \: about \: understanding! \: }$

Given,

Length of Train = 100 m

Length of Bridge = 140 m

Total length = (100 + 140) = 240 m (Distance)

Speed = 60 km/hr

$= 60 \times \frac{5}{18} = \frac{300}{18} = 16.6 \: m/</p><p>sec$

${ \large{ \boxed{ \bold{ \purple{Time = \frac{ Distance }{Speed}}}}}}$

$\implies \sf \: \cancel \dfrac{240}{16.6}$

$\implies \boxed{ \sf \: 14.4 \: seconds}$

Hence,Option 3) is correct answer!

If you are reading this please smile :)

Answer 2

Answer:

★The Train will cross the bridge in 14.4 seconds★

Step-by-step explanation:

Given:

• Length of train 100m
• Speed of train is 60 km/HR
• Length of Bridge= 140

To Find: Time taken by train to cross the bridge

Solution :

→ Total Length = ( Length of train + Length of Bridge)

→ ( 100 + 140 ) m

→ 240 metres ........... [ Distance]

and

Speed = 60 km/hr

Changing into m/sec = 60 x 5/18 = 16.6 m/sec

★We know that ↓

$\small\implies{\sf }$ Time = Distance / Speed

$\small\implies{\sf }$ Time = 240/16.6 = 14.45 or 14.4 seconds

Hence, Train will cross the bridge in 14.4 Seconds

∴ Option (3) is correct