one third of a certain journey was covered at a speed of 25 kmph, one fourth of the journey was covered at a speed of 30 kmph and the rest of the speed was covered at a speed of 50kmph. what is the average speed of the whole journey?
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Total distance =L cm of 25,30,50
is, 150km
150x25/3+I50x30/4+3x50 / 12
= 150/75 +150/120 +450/600
= 2400/600=4hrs
Average speed=150/4=37 1/2 km/hr
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