wiz-icon
MyQuestionIcon
MyQuestionIcon
1
You visited us 1 times! Enjoying our articles? Unlock Full Access!
Question

A car travels 30km at a uniform speed of 40 km/h and the next 30km at a uniform speed of 20km/h. Find its average speed.


A

26.7 km/h

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
B

28.7 km/h

No worries! We‘ve got your back. Try BYJU‘S free classes today!
C

26.5 km/h

No worries! We‘ve got your back. Try BYJU‘S free classes today!
D

25.4 km/h

No worries! We‘ve got your back. Try BYJU‘S free classes today!
Open in App
Solution

The correct option is A

26.7 km/h


Total distance = 30 km + 30 km = 60 km

Time taken to move first 30 km, t1 = 3040 = 34 h

Time taken to cover next 30 km, t2 = 3020 = 32 h

Total time taken = t1 + t2 = 34 + 32 = 94 h

Hence, average speed of the person = Total DistanceTotal Time = 60 km(94 h) = 26.7 km/h


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