need, Distance and Time
5. of a certain journey is covered at the rate
of 25 km/h, at the rate of 30 km/h and the
rest of 50 km/h. What is the average speed
for the whole journey? [JNV 2017, 2009]
(1) 30 km/h
(2) 33 km/h
(3) 33.- km/h (4) 32 km/h
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