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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