ce does it cover in 8 seconds?
(c) 160 m
(d) 240 m
distance does he cover in 15 minutes?
c) 30 km
(d) 36 km
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
The correct option is B.
Answer:
Letx consider, x= total distance covered by the car,
Time taken to complete the half distance with velocity v=40km/h,
t1=2×40x=80xhr. . . . .(1)
The time taken to complete another half distance with velocity u=60km/h
t2=2×60x=120xhr
The total time taken, t=t1+t2
t=80x+120x=48xhr
The average speed of the car,
vavg=x/48x=48km/h
Step-by-step explanation: