Question : Gautam goes to work at a speed of 12 km/hr and returns home at 10 km/hr. His average speed is:
Option 1: 11 km/hr
Option 2: 22 km/hr
Option 3: 10.9 km/hr
Option 4: 12.5 km/hr
Latest: SSC CGL preparation tips to crack the exam
Don't Miss: SSC CGL complete guide
New: Unlock 10% OFF on PTE Academic. Use Code: 'C360SPL10'
Correct Answer: 10.9 km/hr
Solution : Given: Gautam goes to work at a speed of 12 km/hr. He returns home at a speed of 10 km/hr. Let the distance between home and office be $x$. Then, the total distance is 2$x$. Time taken to reach office $=\frac{x}{12}$ hr Time taken to reach home $=\frac{x}{10}$ hr Total time to reach office and return home $=\frac{x}{12}+\frac{x}{10} =\frac{5x+6x}{60} =\frac{11x}{60}$ hr Now, Average speed $= \frac{\text{Total distance}}{\text{Total time}}$ $=\frac{2x}{\frac{11x}{60}}$ $= \frac{2x×60}{11x}$ $= \frac{120}{11}$ = 10.9 km/hr (approx.) Hence, the correct answer is 10.9 km/hr.
Candidates can download this ebook to know all about SSC CGL.
Answer Key | Eligibility | Application | Selection Process | Preparation Tips | Result | Admit Card
Question : A boy rides his bicycle 10 km at an average speed of 12 km/hr and again travels 12 km at an average speed of 10 km/hr. His average speed for the entire trip is approximately:
Question : Directions: The distance between the two cities is 30 km. A man goes at a speed of 30 km per hour and returns at 20 km per hour. What is his average speed?
Question : A student goes to school at a speed of $5 \frac{1}{2}$ km/hr and returns at a speed of 4 km/hr. If he takes $4 \frac{3}{4}$ hours for the entire journey, then the total distance covered by the student (in km) is:
Question : A person covers a certain distance by bus at 45 km/hr and immediately returns to the starting point by car at a speed of 80 km/hr. What is his average speed during the whole journey?
Question : A jeep travels to a place 300 km away at an average speed of 60 km/hr and returns at a speed of 30 km/hr. What is the average speed (in km/hr) for the whole journey?
Regular exam updates, QnA, Predictors, College Applications & E-books now on your Mobile