CameraIcon
CameraIcon
SearchIcon
MyQuestionIcon
MyQuestionIcon
0
You visited us 0 times! Enjoying our articles? Unlock Full Access!
Question

A man travels first 50 km at 25 kmph, next 40 km at 20 kmph and then 90 km at 15 kmph. His average speed for the whole journey (in kmph) is:

A
25
No worries! We‘ve got your back. Try BYJU‘S free classes today!
B
20
No worries! We‘ve got your back. Try BYJU‘S free classes today!
C
18
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
D
40
No worries! We‘ve got your back. Try BYJU‘S free classes today!
Open in App
Solution

The correct option is C 18
To find : average speed
speed=DistanceTime
ϑ1=s1t1t1=s1ϑ1
t1=5025=2 hrs
t2=s2ϑ2=4020=2 hrs
t3=s3ϑ3=9015=6 hrs
Average Speed TotalDistanceTotaltimetaken
=s1+s2+s3t1+t2+t3=50+40+902+2+6 km/h
=18010 km/h
= 18 km/h

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