Question

a car travels 150 km with the speed of 50 km per hour then it travels 100 km with the speed of 25 km per hour after then Travels 720 km with 50 m/s find the average speed​

Answer 1

Answer:

Case 1-

v = 50km / hr

s = 150 km

hence , t = 150/50 hr = 3 hrs.

Case 2-

Time( t ) = 100/ 25 hr = 4 hrs.

Case 3

v = 50 m/ s = 180 km/ hr

s = 720 km.

Time (t) = 720/180 hrs = 4 hrs.

Now , total time = 4 + 4 + 3 = 11 hrs.

Total distance = 970 km.

Hence , Average speed = 970 / 11 (km/ hr) = 25 m/s ( approx.)