- Thread starter alfred01
- Start date

I'm probably going about this all wrong.

The circumference is given by the formula pi x D where pi = 3.14 to 2 dp and D = diameter

Poles ten feet high increase the diameter by 20 feet so the two circumferences differ by 3.14 x 20 = 62.8 feet.

Must admit I was surprised by how small the answer was the first time I saw this puzzle and thought I must have made a silly mistake. Well done Elmer - looking forwards to your next one . . .

To arrive at noon the car must have travelled 140/48 x 60 minutes = 175 minutes

So the start time was 2hrs 55mins before noon or 9.05am

The bus would take 140/40 x 60 minutes to travel the journey = 210 minutes

So the bus arrives 3hrs 30mins after setting off

9.05am + 3hrs 30mins = 12.35pm

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