physics
posted by akanksha .
a train 100m long is to cross a river bridge of length 800m. what time it take to cross the bridge ?velocity of train is 36km/h.

Convert speed to m/s:
36 km/h = 36/3.6=10 m/s
In calculating train crossing bridges, we have to remember that after the head of the train has crossed the bridge (800 m), the remainder of the train is still on the bridge. So to completely cross the bridge, the time is what is takes to travel 800+100 metres.
Time required
= (800+100)m /10 m/s
= 90 s 
(a)800 m. (b)1000 m.(c)1500 m.(d)2600 m.
Respond to this Question
Similar Questions

MATH
FOUR CYCLISTS A,B,C&D WANTS TO CROSS A BRIDGE BUT DUE TO BAD CONDITION OF BRIDGE ONLY TWO AT A TIME CAN CROSS IT. IF A TAKES 1 MINUTES, B TAKES 2 MINUTES,C TAKES FIVE MINUTES & D TAKES 10 MINUTES TO CROSS THE BRIDGE, HOW THEY ALL CAN … 
physics
A 200m long train crosses a 400m long bridge with a speed of 36km/hr . Calculate the time taken by train to cross the bridge? 
physics
A 200m long train crosses a 400m long bridge with a speed of 36km/hr . Calculate the time taken by train to cross the bridge? 
maths magic
There are A,B,C,D at one end of the bridge.they have to cross within 17 minutes.only 2 can cross the bridge at atime .since it is very dark one has to come back to show the light and its said that A can cross the bridge in 1 min ,B … 
Physics
A train is moving towards a destroyed bridge. The velocity of the train remains constant at 20 m/s. A person inside the train realizes that they will die unless they run to the back of the train and jump out. If the person is 15 m … 
Physics
Train A starts at 4 miles South of a bridge and heads North at a constant speed of 30 miles per hour. Train B starts 6 miles North of the bridge. a. What velocity must Train B have so that the two trains cross the bridge at the same … 
Physics
James Bond is trying to jump from a bridge and land on the first car of a moving train that is going to pass under the bridge. The train moves at 85 km/h and the vertical height between the bridge and the top of the carriage is 15 … 
physics
James Bond is trying to jump from a bridge and land on the first car of a moving train that is going to pass under the bridge. The train moves at 85 km/h and the vertical height between the bridge and the top of the carriage is 15 … 
hw
a train 100m long is to cross a river bridge of length 800m .what time will it take to cross the bridge ? 
math
A man standing on a railway bridge which is 180 m long. He find that a train cross the bridge in 20 seconds but cross him in 8 seconds. Find the length of the train and its speed.