Henry Ernest Dudeney/Modern Puzzles/29 - Timing the Motor-car

by : $29$

 * Timing the Motor-car
 * "I was walking along the road at $3 \tfrac 1 2$ miles an hour," said Mr. Pipkins,
 * "when the motor-car dashed past me and only missed me by a few inches."


 * "Do you know what speed it was going?" asked his friend.


 * "Well, from the moment it passed me to its disappearance round a corner I took $27$ steps, and walking on reached that corner with $135$ steps more."


 * "Then, assuming you walked, and the car ran, each at a uniform rate, we can easily work out the speed."