The distance covered (in km) by a train moving at 30 m/s in \(3\frac{1}{2}\) hours is
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → 378
The speed is in metres per second and the answer is wanted in kilometres, so first change the speed to km/h by multiplying by \(\frac{18}{5}\) (1 m/s \(=\frac{3600}{1000}\) km/h).
Speed \(=30\times\frac{18}{5}=108\) km/h
Distance \(=108\times3\frac{1}{2}=108\times3.5=\) 378 km