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?
Answer & explanation
Correct answer: option 1
Average Speed = \(\frac{Total\; Distance }{Total\; Time }\)
Distance = Speed × Time
Total distance = 15 + 25 = 40 km
Total time = \(\frac{15 }{30 }\) + \(\frac{25 }{10 }\) = 3 hours
Average speed = \(\frac{40 }{3 }\) km/h