document.write( "Question 1136050: Traffic signals at each intersection on a main road all change on the same 2 minute cycle. A taxi driver knows that it is exactly 3.5km from one intersection to the next. Without breaking the 50km/hr speed limit, what is the highest average speed, in kilometers per hour, he can travel to get to each intersection as it just changes to green? \n" ); document.write( "

Algebra.Com's Answer #753823 by ikleyn(52790) $\"\"$ $\"About$

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document.write( "Moving 3.5 kilometers in 2 minutes, taxi driver has the speed   =  = 3.5*30 = 105 km/h, \r\n" );
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document.write( "which is an obvious violation of the 50 km/h speed limit.\r\n" );
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document.write( "Moving 3.5 kilometers in 4 minutes, taxi driver has the speed   =  = 3.5*15 = 52.5 km/h, \r\n" );
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document.write( "which is a violation of the 50 km/h speed limit, too.\r\n" );
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document.write( "Only moving 3.5 kilometers in 6 minutes, taxi driver reaches his goal without violation of the speed limit.\r\n" );
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document.write( "His speed in this case is     = 3.5*10 = 35 km/h.\r\n" );
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document.write( "ANSWER.  His safe highest speed is 35 kilometers per hour to reach his goal.\r\n" );
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\n" ); document.write( "\n" ); document.write( "Ignore other answer by @rothauserc, since it is INCORRECT SOLUTION.\r
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