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
E. 1 pm
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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