SSC GD 2023 PYQ — Question 54

The correct answer is option 3 i.e. 54 km/h

Length of the train = 90 m

Length of the train = 210 m

Time taken in crossing = 20 sec

Total Distance = Length of the train + Length of the platform

$Speed ={ Distance \over Time}$

According to the given question,

Total distance = Length of train + Length of platform = 90 + 210 = 300 m

Now, Speed of train = $300 \over 20$= 15 m/sec

⇒ $15 \times {18 \over 5}$ = 54 km/h