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Two cyclists,moving with equal speeds of...

Two cyclists,moving with equal speeds of 10 km/hr,are approaching each oher along a straight road.When the distance between them is 20 km a fly starting from cycle,keeps on flying alternatively from one cycle to the other.If the fly has a constant speed of 40 km/hr.Find the total distance travelled by the fly before the cyclists meet is.

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Relative velocity of cyclists of approaching=20km/hr
Time taken to meet the cyclists `=(20)/(20)`=1 hour
Distance travelled by fly= `"speed"xx"time"`
`40xx1=40` km.
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