Question

3.
5km
Two cars are moving with sane velocity of 30 krn h-1
maintaining a distance of 5 krn between them. Speed
of third car moving in the opposite direction and
meeting the two cars at an interval of 240 secs:
(A) 45 krn h-1
(B) 30 krn h-1
(C) 55 km h-1
(D) 35 km h-1
y= 30kmh
v= 30km
​

Answer 1

$Since \: the \: two \: cars \: \\ are \: moving \: in \: the \: same \\ direction \: with \: same \: speed \: \\ therefore \: relative \: speed \: between \\ \: two \: cars \: is \: zero. \: \\ \\ </p><p></p><p>Let \: the \: relative \: speed \: of \\ \: the \: third \: car \: be \\ \: w.r.t \: the \: two \: cars. \\ </p><p></p><p>Relative \: velocity \: of \: the \: third \: \\ car: (4/60)h \: 5km \: = \: 75km/h \\ </p><p></p><p>Actual \: velocity \: of \: the \: third \\ car \: : \: 75−30 \: = \: 45km/h</p><p></p><p>$

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