Question

A train 280 m long crosses the bridge 170 m in 22.5 seconds. Find the speed of the train in km/h. How did we get 22.5 sec =45/2 sec

Answer 1

Step-by-step explanation:

280m+170m=450m

in relative speed concept we add the length of the platform bridge or anything with the length of trainsl remember that if the question is given for the train travelling in opposite direction on train travelling in same direction it might differ

$22.5 = \frac{225}{10} = \frac{225 \div 5}{10 \div 5} = \frac{45}{2}$

$s = \frac{d}{t} \\ \\ s = \frac{450}{ \frac{45}{2} } = 450 \times \frac{2}{45} = 20m {s}^{ - 1}$