Question

a car travel at a speed of 40km/h for 10 min .then at 55kn/hr for 20 minutes and finally at 20 km/h for 20 minutes.what is the average speed of the car?physic class-9​

Answer 1

Speed = 40 km/h ,

Time = 10 minutes,

Distance =(40 × 10/60) = 6.666 km

Speed = 55 km/h,

Time = 20 minutes,

Distance =(55 × 20/60) = 18.333 km

Combined Times = (20 + 10) = 30 minutes ,

Combined Distances = (6.666 + 18.333) = 25 km.

Answer: The Average Speed of the Car was 50 km/h.