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A car moving over a straight path, covers a distance d with constant speed of 40 km/hr and then the same distance with speed 60km/hr. The average speed of car is ..... |
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Answer» 50 km/hr Time `t_(1) = (d)/(40) hr.` And to cover distance d with constant speed 60 km/hr required time `t _(2) = (d)/(60) hr.` `therefore ` TOTAL time required to cover distance 2D is `t = t _(1)+t _(2)` `therefore t = (60 d )/(40) + (d)/(60)` `therefore t = (60 d + 40 d )/(2400)` `therefore t = (d)/(24)` Now average velocity `bar V = (2d)/(t) = 2d xx (24)/(d) = 48 Km//hr` |
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