Round and round and round and..........

Level pending

Tommy cycles to school every day. And every day his little brother, Timmy, chases after him for the whole 1.2km journey trying to count how many times Tommy's front wheel goes round. (You know, the sort of thing annoying little brothers do!!)

Tommy is smarter than Timmy and having measured the radius of his bike wheel at 277mm, has worked out the answer.

If Tommy wants to stop Timmy chasing him every day, what figure does he need to tell Timmy to put him out of his misery?

(Assume a straight journey and Pi=3.14)

960 1200 600 690

Wilf O'Reilly by Wilf O'Reilly , 51, United Kingdom

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2 solutions

Shorouk Shehata
Jan 29, 2014

By calculating the wheel's circumference, (2 X 3.14 X 277E-3 = 1.73956m), then X = 1.2E3 = 1200m, So, (1200 / 1.73965 = 689.829 round).

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Did not understand

Pranto Saha - 7 years, 4 months ago
Shohidul Bulbul
Feb 28, 2014

Here, r= 277mm = .277 m pi= 3.14 Distance= 1.2 km = 1200 m Wheel circumference = 2 X (pi) X r = 2 X 3.14 X .277 = 1.74

total rotation = 1200/ 1.74 = 689.65 = 690 (around)

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