Question

If I travel along the three sides of an equilateral triangle at a speeds of 30 kmph, 40 kmph and 50 kmph
respectively, what is my average speed for the entire journey?​

Answer 1

Answer:

40km/h

Step-by-step explanation:

The three sides of an equilateral triangle are equal, therefore the same distance. Find the average (mean) by adding 30+40+50= 120

120/3=40

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Answer 2

Answer:

38.29 kmph

Step-by-step explanation:

Let each side of triangle is 200km, so total perimeter ie. total distance for travelling all three sides would be 600km.

Time taken when speed is 30kmph = 600/30 = 20 hours

"          "           "         "        "  40kmph = 600/40 = 15 hours

"          "           "         "        "  50kmph = 600/50 = 12 hours

So, average speed = (Total distance travelled)/ (Total time taken)

                               = (600+600+600)/(20+15+12)

                               = (1800)/(47)

                               = 38.29 kmph