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Grade: 12th pass
        a car travels equal distances with successive speeds of 10, 30, 60 and 20 kilometre per hour to go from one point to another point along a straight line its average speed is
one year ago

Answers : (1)

Vikas TU
6874 Points
							
Let x be the distance in each case.
x = 10*t1
and
x = 30*t2
and
x = 60*t3
and
x = 20*t4
and
t = t1 + t2 + t3 + t4
avg. speed = total distance / total time
                = 4x/t => 4x/(x/10 + x/30 + x/60 + x/20) 
                        => 4/((6+2+1+3)/60))
                        => 4*60/12
                        => 20 Km/hr.
one year ago
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