Two trains running in opposite directions to each other, cross a man standing on the platform in 30 sec and 12 sec respectively and they cross each other in 20 seconds. Find the ratio of their speed.

Two trains going in opposite directions with the same speed are at rest relative to each other. True/False.

Two streamlines cannot cross each other. Why?

Two trains having lengths 120 m and 100 m running in the opposite directions with velocities 40 km/h and 50 km/h. In what time they will completely cross each other?

Two wave pulses travel in opposite directions on a string and approch each other. The shape of the one pulse is same with respect to the other

Two trains are each 50 m long moving parallel towards each other at speeds 10 ms^(-1) and 15 ms^(-1) respectively, at what time will they pass each other ?

Two train travelling in opposite directions at 126 km/hr each, cross other while one of them is whistling if the frequency of the node is 2.22 kHz find the apparent frequency as head by an observer in the other train : (a) Before the trains cross each other (b) After the trains have crossed each other (V_("sound") = 335 m//sec)

Two trains each of length 50m. are running with constant speeds on parallel tracks. While moving in same direction one over takes the other in 40 seconds and while moving in opposite direction on ecrosses the other in 20 seonds. The speeds of trains will be:-

The distance between two particles is decreasing at the rate of 6 m/sec,when they travel in opposite direction to each other. If these particles travel with same speeds and in the same direction, then the separation increase at the rate of 4 m/sec. The particles have speed as

Two trains A and B 100 m and 60 m long are moving in opposite direction on parallel tracks. The velocity of the shorter train is 3 times that of the longer one. If the trains take 4s to cross each other, the velocities of the trains are

A train 180 m long crosses a standing man in 12 seconds . Find the speed of the train in km per hour .