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A car travel up a hill at a constant speed of 40km/h and returns down the hill at constant speed of 60km/h.Calculate the average speed for the round trip
4 months ago

Arun
23811 Points

Let the distance = d
so, total distance = 2d
In first stretch,
distance = d
speed = 40 km/h
time = distance/speed
= d/40 hrs
On second stretch,
distance = d
speed = 60 km/ h
time =distance /speed
= d/60 hrs
total time = d/40 + d / 60
= 3d+ 2d / 120
= 5d/ 120
= d/24
average speed = total distance /total time
= 2d / d / 24
= 2d × 24/d
= 2×24 = 48 km/h
4 months ago
Vikas TU
10573 Points
4 months ago
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### Course Features

• 110 Video Lectures
• Revision Notes
• Test paper with Video Solution
• Mind Map
• Study Planner
• NCERT Solutions
• Discussion Forum
• Previous Year Exam Questions