A car travels a distance of 200 km in 4 second the next 220 km in 2 sec calculate the average speed of car in km per hour
Answers
Answer:The average speed formula is Avg speed = distance traveled / elapsed time. Since the first car and the second car traveled equal distances in different elapsed time, the formula becomes Avg speed = (1/2 distance + 1/2 distance) / (time1 + time2). The duration of time2 will be only 40/60 of time1.
The resulting formula is then Avg speed = total distance traveled / time1 + 2/3 * time1). The distance traveled by car1 after one hour is 40 km and car2 takes the same distance in only 40 minutes or 2/3 hour. The total distance traveled by both cars is 80 km. Using the modified formula for average speed,
Avg speed = 80 km / (1 + 2/3) hr
Avg speed = 80 km / (5/3) hr
Avg speed = 80 km * (3/5) hr
Avg speed = 240 km / 5 hr
Avg speed = 48 km / hr