A train does a journey without stoppage in 8 hours, if it had travelled 5 km/h faster, it would have done the journey in 6 hours 40 minutes. Find its original speed.\nOptions:\n(A) 25 km/h\n(B) 40 km/h\n(C) 45 km/h\n(D) 36.5 km/h\n(E) None of these Think first, then make a decision. Some random thoughts:
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Let original speed = S km/h\nHere, distance to be covered is constant\n∴ S × 8 = (S + 5)(20⁄3)\n⇒ 8S - 20⁄3S = 100⁄3 ⇒ S = 100⁄4 = 25 km/h So the answer is (A).
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