A car travels from A to B at 40 km/h and returns along the same road at 60 km/h. What is the average speed for the whole trip, in km/h?
Answer and explanation
Correct answer: D.
- Step 1: For a distance each way, total time is . Step 2. Average speed . **Answer: . Why not the others:** takes the simple average of the two speeds; adds 5 to the simple average; uses the difference of the speeds.
Practise more Number, Algebra, Data Sufficiency and Probability.
Free questions with an explanation for every one, and full timed Högskoleprovet (Sweden) mock tests.
More Number, Algebra, Data Sufficiency and Probability questions
- A jacket costs 800 kr. During a sale its price is reduced by 25%. What is the sale price?
- Solve the equation .
- What is the next number in the sequence 3, 7, 11, 15, ... ?
- A train travels 240 km in 3 hours at a constant speed. How far does it travel in 5 hours at the same speed?
- What is the mean of the numbers 4, 8, 9 and 15?
- A rectangle has an area of 48 cm and a width of 6 cm. What is its perimeter?