A car travels 50km at a uniform speed of 100 km/hr and the next 40 km at a uniform speed of 80 km/hr. Find the average speed for the entire journey.
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Explanation:
Distance = 50 km with speed = 100km/hr
Time = Distance /speed = 50/100 = 1/2 hr
Distance = 40 km with speed = 80 km/hr
Time = 40/80 = 1/2 hr
Total time = 1 hr
Total distance = 50+40 = 90 km
Average speed = Total distance/ Total time
= 90/1 = 90 km/hr
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