Question

By cycle a man, 1/5 of certain distance is covered at the rate of 6 km/h. 1/3 at the rate of 5 km/h and rest at 3 km/h. Find the average speed for the whole journey ?

Answer 1

Answer:

Step-by-step explanation:

Let total distance = 15x

by cycle= 1/5 of 15x= 3x ,    time= 3x/6

by anything= 1/3 of 15x= 5x ,  time= 5x/5=x

rest distance= 15x-(3x+5x)= 7x, time= 7x/3

Now find total time= Total distance/ total speed  = 3x/6+x+7x/3=13x/6

Average speed= total Distance / total time= 15x* 6/13x=90/13=6.9 km/h