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

Modern Puzzles by Henry Ernest Dudeney: $29$

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."

Sources

• 1926: Henry Ernest Dudeney: Modern Puzzles ... (previous) ... (next): Arithmetical and Algebraical Problems: Locomotion and Speed Puzzles: $29$. -- Timing the Motor-car
• 1968: Henry Ernest Dudeney: 536 Puzzles & Curious Problems ... (previous) ... (next): Arithmetical and Algebraical Problems: Speed & Distance Puzzles: $57$. Timing the Motor-car