A car covered the first 100 km at a speed of 50 km/h. It covered next 140 km at a speed of 70 km/h. What is its average speed?
Answer & explanation
Correct answer: option 1
Time = \(\frac{Distance }{Speed}\)
Time 1 = \(\frac{100 }{50}\) = 2 hours
Time 2 = \(\frac{140}{70}\) = 2 hours
Average speed = \(\frac{100 + 240 }{2 + 2}\)
= \(\frac{240 }{4}\)
= 60 km/h