A train running at the speed of 72 kmph crosses a pole in 12 seconds. Find the length of the train. MCQ with Answer and Explanation

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A train running at the speed of 72 kmph crosses a pole in 12 seconds. Find the length of the train.

A. 220 m

B. 240 m

C. 260 m

D. 200 m

Answer: Option B

Solution (By JKSSB Mock Tests)

Speed = 72 × 5/18 = 20 m/s. Length = 20×12 = 240 m.

This question belongs to: Maths Percentage

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Question #1

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A number is increased by 20% and then decreased by 25%. The result is 36 less than the original. Find the original number.

A. 300

B. 360

C. 400

D. 320

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Correct Answer: Option B

Explanation:
1.2 × 0.75 = 0.9. 0.9x = x - 36 → 0.1x = 36 → x = 360.

This question belongs to: Maths Percentage

Question #2

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Radius of circle decreased 20%. Area decreases by:

A. 32%

B. 38%

C. 36%

D. 34%

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Correct Answer: Option C

Explanation:
Area multiplier = 0.8² = 0.64, decrease 36%.

This question belongs to: Maths Percentage

Question #3

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Income of A is 20% more than B. B's expenditure is 30% less than A's. A saves 10% of his income. B saves what % of his income?

A. 26.4%

B. 28.4%

C. 22.4%

D. 24.4%

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Correct Answer: Option D

Explanation:
Let B inc = 100, A inc = 120. A sav = 12, A exp = 108. B exp = 70% of 108 = 75.6. B sav = 100-75.6 = 24.4, i.e. 24.4%.

This question belongs to: Maths Percentage

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