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दो कारें P तथा Q एक ही समय पर किसी बिन्दु से सरल रेखा चना प्रारम्भ करती हैं और उनकी स्थितियों को क्रमशः Xp (t) = at + bt2 तथा XQ(t) = ft - t2 किस समय पर इन दोनों का वेग समान होगा:

(a) \(\frac{f-a}{2(l+b)}\)

(b) \(\frac{a-f}{(l+b)}\)

(c) \(\frac{a+f}{2(b-l)}\)

(d) \(\frac{a+f}{2(l+b)}\)

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