a train 50 m from bridge going east to west with a speed 10m/sec another train which is other side of bridge and 100 m from the bridge going west to east.if both will come at the same time on bridge,train will collide.lenght of bridge is 50m.what could maximum speed of second train so that first train pass the bridge before reaching second train.neglect the length of train.
Options.
A) 20 B) 15 C) 12 D) 8 E) 10
time taken by first train to cross the bridge=(50+50)/10= 
<gadget id="calculator">(50+50)/10</gadget>
<output>10</output>
10sec.   so this is the min. time which second train should take to reach the bridge,   max. speed of second train= 100/10= 
<gadget id="calculator">100/10</gadget>
<output>10</output>
10m/sec   answer 10
<result>E</result>
a train 50 m from bridge going east to west with a speed 10m/sec another train which is other side of bridge and 100 m from the bridge going west to east.if both will come at the same time on bridge,train will collide.lenght of bridge is 50m.what could maximum speed of second train so that first train pass the bridge before reaching second train.neglect the length of train.