A helicopter flies along the sides of a square field of side length 100 kms. The first side is covered at a speed of 100 kmph, and for each subsequent side the speed is increased by 100 kmph till it…
Question and options
A helicopter flies along the sides of a square field of side length 100 kms. The first side is covered at a speed of 100 kmph, and for each subsequent side the speed is increased by 100 kmph till it covers all the sides. The average speed of the helicopter is
- 250 kmph
- 184 kmph
- 192 kmph
- 200 kmph
Answer and explanation
Correct answer: C - 192 kmph
Times: 100/100+100/200+100/300+100/400 = 1+1/2+1/3+1/4 = 25/12 h. Average speed = 400/(25/12) = 192 kmph.
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IPMAT Indore
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