12

One afternoon, Brian the snail went for a slither at a constant speed. By 1:50 pm he had slithered 150 centimetres. By 2:10 pm he had slithered 210 centimetres. When did Brian start his slither?

A. Noon

B. 12:20 pm

C. 12:30 pm

D. 12:45 pm

E. 1 pm

Answer

E. 1 pm

SOLUTIOn

In the 20 minutes between 1:50 pm and 2:10 pm, Brian slithered (210 − 150) cm = 60 cm.So Brian slithered at a rate of 3 cm per minute and therefore took 50 minutes to slither 150 cm.Hence Brian started his slither at 1 pm.

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