Brain Teasers
A Van
A van travels a maximum of 100 km/h. Its speed decreases in proportion with the number of passengers. The van can carry a maximum of seven people. Given that the van can travel 88 km/h with 3 people in the van, what will be the speed of the van when 6 people are on board?
Hint
(100-88)/3=4 km/hr/personAnswer
100 - 3t = 88100 - 88 = 3t
t = 12/3
t = 4 km/h reduction in speed per person
When six persons are on board, the van travels at
100 - 6t = 100 - 6(4) = 76 km/h.
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