Question
A man covers 250 km, 120 km, and 50 km at the speed of
50 km/h, k km/h and 25 km/h, respectively. If his average speed for the whole journey is 42 km/h, then what is the value of k?Solution
ATQ- Total distance =250+120+50=420km. Speed =50km/h, K km/h and 25km/h. 
294k+5040 =420k 126k =5040 k =5040/126=40 k =40.Â
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