document.write( "Question 1201052: Hi
\n" ); document.write( "A black car travelled from a to c at 60km per hour. A blue car took 4 hours to travel the same distance. Both cars passed b at 2pm and the blue car reached c at 3pm. If b was 80km from c , what time did the black car leave a .\r
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Algebra.Com's Answer #835519 by MathTherapy(10552) $\"\"$ $\"About$

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document.write( "A black car travelled from a to c at 60km per hour. A blue car took 4 hours to travel the same distance.  Both cars passed b at 2pm and the blue car reached c at 3pm. If b was 80km from c , what time did the black car leave a .\r\n" );
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document.write( "He's WRONG!!!!\r\n" );
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document.write( "Blue car took 4 hours to get from a to c, got to c at @ 3:00 p.m., so it left \"a\" 4 hours before 3:00 p.m. or at 11:00 a.m.\r\n" );
document.write( "Blue car passed b at 2:00 p.m., and got to c at 3:00 p.m., so it took 1 hour to get from b to c, which means that it took\r\n" );
document.write( "3 hours to travel from a to b. As it's 80 km from b to c, and blue car took 1 hour for the trip, blue car's speed, from b\r\n" );
document.write( "to c, was 80(1) = 80 km/h. That was also its speed from a to b.\r\n" );
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document.write( "Now, since blue car's speed was 80 km/h, and it took 3 hours to travel from a to b, then distance from a to b is 80(3) = 240 km.\r\n" );
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document.write( "With a speed of 60 km/h, the distance from a to b being 240 km, the black car's time taken to travel 240 km from a to b, would be  = 4 hours.\r\n" );
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document.write( "Since the black car took 4 hours to travel from a to b, it's obvious that the black car left \"a\" 4 hours before arriving at b, or 4 hours before 2:00 p.m. which was: 10:00 a.m.

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