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math help! Question 19 for homework! ?


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Old 10-24-2008, 07:32 AM
decade decade is offline
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Default math help! Question 19 for homework! ?

bus = b
airplane = a

equation :
60b + 700a = 1900
b+a = 7

means
60b + 700a = 1900
60b + 60a = 420
640a = 1480
a = 2.3125 hours (2 5/16 hrs) by airplane
b = 4.6875 hours (4 11/16 hrs) by bus

distance covered
bus = 4.6875 * 60 = 281.25 km
airplane = 2.3125 * 700 = 1618.75 km
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