Question

1)a car covers first half of the distance between 2 places at a speed of 80km/hr what is the average speed of the car



2) a car travels with a speed of 10 km/hr for 10 min and then with 40 km/hr for 4 min find the total distance travelled and average speed of the car​

Answer 1

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
​
=