CameraIcon
CameraIcon
SearchIcon
MyQuestionIcon
MyQuestionIcon
1
You visited us 1 times! Enjoying our articles? Unlock Full Access!
Question

A speeding car travelling at 40km/hr decides to slow down to 30km/hr after covering half the distance. What is the average speed?

A
34.29km/h
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
B
35.36km/h
No worries! We‘ve got your back. Try BYJU‘S free classes today!
C
36.32km/h
No worries! We‘ve got your back. Try BYJU‘S free classes today!
D
33.24km/h
No worries! We‘ve got your back. Try BYJU‘S free classes today!
Open in App
Solution

The correct option is A 34.29km/h
Lets consider x= total distance covered by the car
Half of the distance covered with speed 40km/h at time t1
t1=x80hr
Remaining half distance covered with speed 30km/h at time t2
t2=x60hr
Total time, t=t1+t2
t=x80+x60=7x240hr
Average speed,
vavg=TotaldistanceTotaltime
vavg=x7x/240=2407
vavg=34.29km/h
The correct option is A.

flag
Suggest Corrections
thumbs-up
0
Join BYJU'S Learning Program
similar_icon
Related Videos
thumbnail
lock
Speed and Velocity
PHYSICS
Watch in App
Join BYJU'S Learning Program
CrossIcon