One-half of a certain distance is covered at 40 km/h,
one-third of it at 80 km/h and the rest at 120 km/h. Find
the average speed for the whole journey
Answers
Answer:
Letx consider, x= total distance covered by the car,
Time taken to complete the half distance with velocity v=40km/h,
t
1
=
2×40
x
=
80
x
hr. . . . .(1)
The time taken to complete another half distance with velocity u=60km/h
t
2
=
2×60
x
=
120
x
hr
The total time taken, t=t
1
+t
2
t=
80
x
+
120
x
=
48
x
hr
The average speed of the car,
v
avg
=
x/48
x
=48km/h
Answer:
This is the answer check it is it correct or not......
Step-by-step explanation:
Here. the person covers ½ of his Journey at 40 km/h, 1/3 at 60 km/h and rest
Here. the person covers ½ of his Journey at 40 km/h, 1/3 at 60 km/h and rest(1−12−13=16) at 30km/h
Here. the person covers ½ of his Journey at 40 km/h, 1/3 at 60 km/h and rest(1−12−13=16) at 30km/h=112×40+13×60+16×30
Here. the person covers ½ of his Journey at 40 km/h, 1/3 at 60 km/h and rest(1−12−13=16) at 30km/h=112×40+13×60+16×301180+1180+1180
Here. the person covers ½ of his Journey at 40 km/h, 1/3 at 60 km/h and rest(1−12−13=16) at 30km/h=112×40+13×60+16×301180+1180+11807209+4+4=72017=42.35km/h