during first half of the journey a body travels with speed of 40km/hrs and in next half it travels with speed of 20km/hrs.Calculate the average speed of the whole journey
It covers a distance of 80 km in first half it takes 1 hr to cover 40 km at speed of 40 kmph in second half it takes 2hr to complete 40 km at speed of 20kmph so average speed is 80/3 kmph
