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Answer on Other Math Question for moussah

Question #5926
Two lanes of a motorway are being resurfaced.Each lane is 4 metres wide.The speed limit through the road works is 80 km/h.It takes 15 minutes to drive through the road works at this speed.Calculate the area being resurfaced
Expert's answer
As it takes 15 minutes ( = 0.25 hour ) to drive through the road with a speed of 80 km/h, then the length of the road works interval is L = 80*0.25 = 20 km. We know that the width of a lane is 4 metres ( = 0.04 km), so the area of a lane is A = 20*0.04 = 0.8 square kilometers. There are two resurfaced lanes so the result area is 0.8*2 = 1.6 km².

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Assignment Expert
26.04.2013 08:47

You're absolutely right! Thanks for correcting us.

25.04.2013 14:05

isnt 4 metres 0.004 km?

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