Question

3) A bus moves 30 Km in 30 min and the next 30 Km in 40 min. Calculate the average speed for the entire journey.

Answer 1

1500/29km/hr

Explanation:

total distance covered=60km

total time taken=70min=1hr10 min=1.16hr

average speed=total distance covered/total time

average speed=60/1.16=6000/116=1500/29Km/hr

Answer 2

speed of car = 30km/hr

time taken = 30min

In hour = 30/60

           = 1/2hr

distance travelled = speed x time

                              = 30 x 1/2

                              = 15km

2. Next, the speed of car = 30km/h

time taken = 40 min

In hour = 40/60

           = 2/3hr

distance travelled = speed x time taken

                              = 30 x 2/3

                              = 20km

Average speed = total distance covered /total time taken

                         = 20+15 / 1/2+2/3

                         = 35 / 7/6

                          = 35 x 6/7

                          = 210/7

                          = 30km/hr

therefore, average speed is 30km/hr

thank me later