If two trains are moving towards each other with velocities of 50 km/h and 60 km/h respectively. A fly flies to and fro in between them at a speed of 5 km/h. The initial distance between the trains is 220 km. How much distance will the fly cover before the trains crash?

5 km

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10 km

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15 km

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20 km

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Solution

The correct option is D 10 km
Let us first calculate the time the trains take to crash.
$T i m e = \frac{d i s t a n c e}{r e l a t i v e s p e e d}$
$T i m e = \frac{220 k m}{110 k m / h} = 2 h$
The distance travelled by the fly is = $t i m e \times s p e e d = 2 h \times 5 k m / h = 10 k m$
Hence option B is correct.

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If two trains are moving towards each other with velocities of 50 km/h and 60 km/h respectively. A fly flies to and fro in between them at a speed of 5 km/h. The initial distance between the trains is 220 km. How much distance will the fly cover before the trains crash?

The correct option is D 10 kmLet us first calculate the time the trains take to crash. Time=distancerelative speedTime=220 km110 km/h=2 hThe distance travelled by the fly is = time×speed=2h×5km/h=10kmHence option B is correct.