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3. A train crosses two persons going in same di-
rection with respective speeds of 3 km/hr and
5 km/hr in 10 sec. and 11 sec. respectively.
What is speed of train?
एक रेलगाड़ी उसी दिशा में क्रमश: 3 किमी/घण्टा, 5 किमी/घण्टा की
चाल से चलने वाले दो व्यक्तियों को क्रमश: 10 सेकण्ड तथा 11
सेकण्ड में पार करती है । रेलगाड़ी की रफ्तार क्या है ?
(B) 27 km / hr
(D) 24 km/hr
(A) 28 km/hr
(C) 25 km/hr

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