Ritu covers a distance of 40 km at 20 km/h and another distance at 40 km/h in 3 hours. Find the average speed for the whole journey.
32 km/h
For the first part, time \(= \frac{\text{distance}}{\text{speed}} = \frac{40}{20} = 2\) hours.
For the second part, the journey is at 40 km/h for 3 hours, so distance \(= 40 \times 3 = 120\) km.
Total distance \(= 40 + 120 = 160\) km, and total time \(= 2 + 3 = 5\) hours.
Average speed \(= \frac{\text{total distance}}{\text{total time}} = \frac{160}{5} = 32\) km/h.
Hence, the average speed for the whole journey is 32 km/h.
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