Question

One third of a certain jaurney was covered at a rate of 25 km per hour, one fourth at the
rate of 30 km per hour and the rest at the rate of 50 km per hour. The average speed for the whole
journey is
(a) 33 1/3 km/hr
(b) 66 1/3 km/hr
(c) 36 1/6 km/hr
(d) 63 1/3 km/hr

Answer 1

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