Question

8. A train 100 meters long completely crosses a 300 meters long bridge in 45 seconds. What
is the speed of the train is?
(a) 32 kmph
(b) 36 kmph (c) 40 kmph (d) 48 kmph
9. A train passes a man standing of the platform. If the trains is 170 meters long and its​

Answer 1

GiVen:

• Total distance travelled by train = 100 + 300 = 400 m

• Time taken = 45 seconds.

AnSwer:

★ According to the question,

$\sf \longmapsto \: \: \: Speed : - \\ \\ \sf \longmapsto \: \: \: \dfrac{400}{45} \\ \\ \sf \longmapsto \: \: \: \frac{80}{9} m/s \\ \\ \sf \longmapsto \: \: \: \frac{80}{9} \times \frac{18}{5} km/hr \\ \\ \sf \longmapsto \: \: \: 16 \times 2 \: km/hr \\ \\ \sf \longmapsto \: \: \:{ \underline{ \boxed{ \sf{ \purple{ \: 32 \: km/hr \: }}}}} \: \bigstar$

Therefore, speed of the car is 32 km/h.