Question : A car travels the first 160 km at a speed of 64 km/hr and the next 160 km at a speed of 80 km/hr. What is the average speed for the first 320 km of the tour?
Option 1: 70 km/hr
Option 2: 71.11 km/hr
Option 3: 66 km/hr
Option 4: 75.32 km/hr
Correct Answer: 71.11 km/hr
Solution :
The first 160 km are travelled at 64 km/hr.
Time taken for this journey $=\frac{160}{64} = 2.5$ hr
Next 160 km are travelled at 80 km/hr.
Time taken for this journey $=\frac{160}{80} = 2$ hr
Hence, the total time taken for the journey of 320 km = (2.5 + 2) = 4.5 hr
Hence, the average speed for first 320 km $=\frac{320}{4.5} = 71.11$ km/hr
Hence, the correct answer is 71.11 km/hr.
Related Questions
Know More about
Staff Selection Commission Combined Grad ...
Result | Eligibility | Application | Selection Process | Preparation Tips | Admit Card | Answer Key
Get Updates Brochure
Your Staff Selection Commission Combined Graduate Level Exam brochure has been successfully mailed to your registered email id “”.
