A travels 15 km with a speed of 30 km/h. He travels another 25 km with a speed of 10 km/h. What is his average speed for the entire journey?
Total time taken in the journey = $$ \frac{15}{30} + \frac{25}{10} = \frac{90}{30} = 3 hours$$
Total distance = 15 + 25 = 40 km
Average speed = $$\frac{40}{3}$$ km/hr
So, the answer would be option a)$$\frac{40}{3}$$ km/h
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