A car moves a distance of 200 m. It covers first half
of the distance at speed 60kmh
−1
and the second half
at speed u. If the average speed is 40kmh
−1
, the value
of u is
(1) 30 kmh−1
(2) 13 kmh−1
(3) 60 kmh−1
(4) 40 kmh−1
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A car moves a distance of 200 m. It covers first half
of the distance at speed 60kmh
−1
and the second half
at speed u. If the average speed is 40kmh
−1
, the value
of u is
(1) 30 kmh−1
(2) 13 kmh−1
(3) 60 kmh−1
(4) 40 kmh−1
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