2. A motorist covers a certain distance at a average speed of 48 km/h in 45 minutes. What speed in km/h he must maintain to cover the same distance in 30 minutes ? (b) 79 km/h (C) 80 km/h (d) 72 km/h (a) 66 km/h
Added by Kyle H.
Step 1
The motorist covers the distance in 45 minutes. Since 1 hour = 60 minutes, 45 minutes = 45/60 hours = 0.75 hours. Show more…
Show all steps
Close
Your feedback will help us improve your experience
Varsha Aggarwal and 101 other Physics 101 Mechanics educators are ready to help you.
Ask a new question
Labs
Want to see this concept in action?
Explore this concept interactively to see how it behaves as you change inputs.
Key Concepts
Recommended Videos
A motorist travels for 3.0 h at 80 km/h and then for 2.0 h at 100 km/h. What is her average speed for the trip? A) 85 km/h B) 88 km/h C) 90 km/h D) 92 km/h
Sparsha S.
A man, who has to walk 11 km, finds that in 30 minutes he has travelled two ninth of the remaining distance. What is his speed in km/h? (A) 4 (B) 4.5 (C) 4.8 (D) 4.2
Dj T.
A car moving on a straight road covers one third of the distance with $20 \mathrm{~km} / \mathrm{hr}$ and the rest with 60 $\mathrm{km} / \mathrm{hr}$. The average speed is (a) $40 \mathrm{~km} / \mathrm{hr}$ (b) $80 \mathrm{~km} / \mathrm{hr}$ (c) $46 \frac{2}{3} \mathrm{~km} / \mathrm{hr}$ (d) $36 \mathrm{~km} / \mathrm{hr}$
Recommended Textbooks
University Physics with Modern Physics
Physics: Principles with Applications
Fundamentals of Physics
Transcript
Watch the video solution with this free unlock.
EMAIL
PASSWORD