Question

Two trains of length 200 and 100m simultaneously enter a tunnel of length 300m from opposite ends at the same tome on parallel tracks. The respective speed of the two trains are 36km/h and 18km/h. After how much time from the instant the two trains entered the tunnel will the tunnel be free of traffic again​

Answer 1

Answer:

Time which trains cross each other

t=lA+lBvA/B=100+2004V=3004v

15=3004v⇒v=5m/s

vA=3v=15m/s

vB=v=5m/s

Explanation:

Answer 2

Answer:

Thus, it covers up less space but we feel more heat there when it goes up from equator towards poles, the sun rays become slanting. ... Although these slanting rays heat up more space, the degree of hotness is felt less. This is the reason why amount of insolation decreases from equator towards poles.