Problems on Trains

1

A train running at a certain speed  crosses another train running in the opposite direction in  4.8 seconds. to find out the speed of the first train , which  of the following information P and Q  is sufficient ?

P : Then  length of the first train                          Q  :  The length  of the second train

A. only P is sufficient
B. only Q is sufficient
C. either P or Q is sufficient
D. Both P and Q are needed
E. Both P and Q are not sufficient

2

A train running at a certain speed crosses a stationary engine in 20 seconds . to fine out the speed of the train  which of the following information is necessary  ?

A. Only the length of the train
B. Only the length of the engine
C. Either the length of the train or the length of the engine
D. Both the length of the train or the length of the engine

3

Two trains, one from Howrah to Patna and the other from  Patna to Howrah , start simultaneously . After  they meet , the trains reach their destinations after 9 hours and 16 hours. respectively . The ratio of heir speeds is :

A. 2 : 3
B. 4 : 3
C. 6 ; 7
D. 9 : 16

4

A train X starts from Meerut at 4 p.m. and reaches Ghaziabad at 5 p.m.  while anther rain y starts from Ghaziabad at 4 p.m. and reaches Meerut at 5.30 p.m.  The two trains will cross each other at

A. 4.36 p.m.
B. 4. 42 p.m.
C. 4.48 p.m.
D. 4.50 p.m.

5

Two stations A and B are 110 km apart on a straight line One train starts from A at 7 a.m and travels towards  B at 20 kmph , Anther train starts from B at 8 a.m. and travels towards A at a speed of 25 kmph . At what time will they  meet ?

A. 9.a.m.
B. 10 a.m.
C. 10.30 a.m.
D. 11 a.m.