Question

41. a person traveled 4 sides of the triangle with speed of a 100 200 300 400 km/hr. what is the average speed of the whole journey. ans 192 km/hr.

Answer 1

yes the answer is right 192 km/hr.

Answer 2

Answer:

192 km/hr

Step-by-step explanation:

Concept : Average Speed = Total distance/Total Time.

Let us assume that the side of the square = LCM (100,200,300,400) = 1,200 km.

Now, time taken across the first side = distance/speed = 1200/100 = 12 hr.

Similarly, times taken across the other three sides = 1200/200 = 6 hrs, 1200/300 = 4 hrs and 1200/400 = 3 hrs.

Thus, total distance = 1200*4 = 4800 km.

Also, total time = (12+6+4+3) = 25 hours.

Thus, average speed from the above concept = 4800/25 = 192 km/hr.