A bird is sitting on a train a moving towards east with velocity 300km/hr. another train b ofvsame speed is moving in west direction on the same track .when the trains are 6 km apart the bird starts flying with a velocity 30 km/hr with respect to ground towards b it returns back to a and continue repeating this process until the trains collide. in this process the total distance travelled by the bird is
Answers
Answer:
0.3 km
Step-by-step explanation:
A bird is sitting on a train a moving towards east with velocity 300km/hr. another train b of same speed is moving in west direction on the same track .when the trains are 6 km apart the bird starts flying with a velocity 30 km/hr with respect to ground towards b it returns back to a and continue repeating this process until the trains collide. in this process the total distance traveled by the bird is
We need to find distance traveled by bird
Speed of bird is given.
If we know the time for which bird traveled we can wind distance covered by bird
Time = Time taken by train to collide after bird fly
Distance between Train = 6 km when bird fly
Total Speed of Train = 300 + 300 = 600 km/ Hr ( as train approaching each other)
Time = 6/600 = 1/100 hr
Distance traveled by bird = 30 * (1/100) = 0.3 km
This is only theoretical answer
Question statements to be true speed of Bird should have been faster than Train speed .other wise bird would not even be able to reach another train until train collide
as each train traveled 3 km while bird only traveled 0.3 km
Answer:
Correct option is
C
300 m
Relative velocity between trains: 600mkh
−1
Time taken for crash is:
t=
v
d
=
600
6
=
100
1
hours=36s
Velocity of bird =30kmh
−1
=30∗
18
5
ms
−1
Distance traveled by bird is =30∗
18
5
∗36=300m
Hence option C is the answer.