2. in a journey of 250km, the car covered first 150km at speed of 30kmph, then there was a halt of 3 hours. The remaining distance was then covered at speed 50kmph. Determine the average speed for the entire journey.
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We know that, Speed = Distance / Time
So, time taken to travel first 150 km, t1 = Distance / Speed = 150 / 30 = 5 h
Time taken to travel next 60 km, t2 = Distance / Speed = 60 / 40 = 1.5 h
Total distance travelled = 210 km
Total time taken = t1 + t2 = 5 + 1.5 = 6.5 h
So, average speed = Total distance / Total time = 210 / 6.5 = 32.308 km/h
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