Question

a train travels 68 km at an average speed of 51 km/h. it then travels another 20 km at an average speed of 40 km/h before reaching its destination. calculate the average speed of whole journey?
since time = distance/speed, and
avg speed = totaldistance/totaltime,

= (68+20)/(68/51 + 20/40) = 48 km/hr

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