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

Explanation

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=40km.`