Question

Q3) A train 360 m long is running at a speed of 45 km/hr. What time will it take to cross a

140 m long bridge​

Answer 1

Answer:

40 second is the answer

Step-by-step 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

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Answer 2

Answer:

${ \sf{ \underline{ \red{ \underline{ \red{Given}}}} : - }}$

$\displaystyle \sf \longrightarrow \: \small{ \rm{ \green{speed \: = 45 \frac{km}{h} }}} \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \\ \\ \displaystyle \sf \longrightarrow \: \small{ \rm{ \green{speed \: = 45 \times \frac{5}{18} = \frac{25}{2} \frac{km}{h} }}} \\ \\ \displaystyle \sf \longrightarrow \: \small{ \rm{ \green{distance \: = 360 + 140 = 500m}}}$

${ \sf{ \underline{ \red{ \underline{ \red{Solution}}}} : - }}$

$\displaystyle \sf \longrightarrow \: \small{ \rm{ \green{time = \frac{distance}{time} }}} \\ \\ \displaystyle \sf \longrightarrow \: \small{ \rm{ \green{time = \frac{500 \times 2}{25} }}} \\ \\ \displaystyle \sf \longrightarrow \: \small{ \rm{ \green{ \frac{1000}{25} }}} \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \\ \\ \displaystyle \sf \longrightarrow \: \small{ \rm{ \green{ \boxed{40s}}}} \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \:$