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A car travels with a speed of 30 km/h for 6 hours and then with the speed of 80 km/h for x hours. The average speed comes out to be 50 km/h. Find the value

of x


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30km/h→6hr, So D1= 180km, 80km/h→'x'hr, So D2=80x km, Avg speed= total distance÷total time, 50=[180+80x]÷[6+x], 30x=120, x=4
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