A cyclist covers the first 6 kilometers of her journey in 20 minutes and the next 9 kilometers in 30 minutes. What is her average speed for the entire trip in kilometers per hour (km/h)?
18 km/h
Average speed = total distance ÷ total time.
Total distance = 6 km + 9 km = 15 km.
Total time = 20 min + 30 min = 50 min = \( \frac{50}{60} = \frac{5}{6} \) h.
Average speed = \( 15 \div \frac{5}{6} = 15 \times \frac{6}{5} = 18 \) km/h.
Hence, the answer is 18 km/h.
Similar Questions
If a cyclist covers a distance of 'D' kilometers in 'T' hours, which formula correctly represents the average speed?
A body moves with a uniform speed and its distance-time graph is a straight line from (0 s, 0 m) to (15 s, 45 m). If the body continues at the same rate, what distance will it cover at 20 s?
Important Questions from Speed and Velocity
Which of the following quantities specifies its speed with direction?
- Which of the following represents non-uniform linear velocity?
- An object starts from rest at x = 0 m and t = 0 s. It moves with a constant acceleration of \(2 \text{ m/s}^2\) along the x-axis. What is its average velocity between time 1 s and 5 s?
- The area under the velocity–time curve between times \(t_1\) and \(t_2\) is equal to the ______ of the object during that interval of time.
- A train travels 45 m in 3 s. What is the speed of the train in km/h?
