Complete Chemistry marathon

You will participate in the marathon, won't you ?

Which of the following combinations of circles best represent athletes, sprinters and marathon runners ?

At the end of the marathon everybody was exhausted.

Which is the winner of the Delhi Half Marathon in men's race?

Usha particpated in a marathon walk and completes the journey in 10 h. if she travels half the distance with a speed of 10 km h^(-1) and rest of the distance with the speed of 15 km h^(-1) then calculate the total distance of the marathon walk.