An engine of length 1000 m moving at 10 m/s. A bird is flying from the start of the engine to the end at x kmph and coming back at 2x. Take total time of bird traveling as 187.5 seconds. Find x and 2x
Correct answer: A
Explanation
Suppose the bird's speed is s and 2s.
While flying at the same direction of the engine's movement, relative speed = (s+10) m/sec
on the reverse direction, relative speed = (2s-10) m/sec
so
1000/(s+10) + 1000/(2s-10) = 187.5 secs
Solving it, we get s= 8.728 m/sec and 2s= 17.456 m/sec
A
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