Question

a passenger train 80 m long takes half a minute in crossing a tunnel 420 M long what is the speed of the train

Answer 1

Passenger train length=80metres
Tunnel length=420metres
then total length that train pass through the tunnel is (420+80)=500metres
Time half minute=30seconds
Speed=500/30=16
$16 \ \frac{2}{3 }$
16 whole 2/3 m/s

Let's check it distance=time ×speed
30×50/3
=500 m✓✓