document.write( "Question 647797: Jennifer drives to her friends house 20km away. There is no direct route so she travels 15km through the city at 50km/h and 15km on the highway at 100km/h. The trip takes 27minutes. Find Jennifer's average speed. \n" ); document.write( "
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Jennifer drives to her friends house 20km away. There is no direct route so she travels 15km through the city at 50km/h and 15km on the highway at 100km/h. The trip takes 27minutes. Find Jennifer's average speed.
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\n" ); document.write( "Avg speed = 2*50*100/(50+100)
\n" ); document.write( "= 200/3 km/hr
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\n" ); document.write( "Or, she went 30 km in 27 minutes
\n" ); document.write( "r = d/t = 30/27 km/min
\n" ); document.write( "= 200/3 km/hr
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