Krishna and Bala decided to have a bicycle race. But the problem was that they had only one bicycle between them! Krishna had a solution. As the road to the airport had a stone demarcating every kilometer, he would ride from the first stone to the fifth, and Bala could ride the remaining distance from the fifth to the tenth stone. Then they could take their respective times with a stopwatch to see who was faster. The ‘race’, however, was a failure. Can you say why?