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 #753830 by MathTherapy(10552) $\"\"$ $\"About$

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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?
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Let the time it takes to get to each intersection be T
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document.write( "Then we get: 
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document.write( ".07 minutes = 
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document.write( "Therefore, T > 4.2 minutes
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document.write( "With T being > 4.2, and the light changing in INTERVALS of 2 minutes, then the time he needs to take to get to each GREEN light = 6 (2 * 3) minutes.
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document.write( "Travelling 3.5 km in 6 minutes, his speed MUST be: 
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document.write( "Tutor @IKLEYN is correct. The other person is WRONG!
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document.write( "Why don't they just leave these problems ALONE, and STOP leading these people ASTRAY? It's not helping when they provide WRONG, RIDICULOUS and/or NONSENSICAL answers.
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document.write( "He even got 2 minutes WRONG! FOR HIS INFORMATION, 2 minutes results in a speed of 105 km/h, EXACTLY, NOT 116+ km/h. \n" );
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