[15 kmph] A person traveled from his house to office at 30 kmph; then he was late to his office by 5 minutes.

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A person traveled from his house to office at 30 kmph; then he was late to his office by 5 minutes. If he increases his speed by 10 kmph he would be early by 15 minutes to his office. What should be his speed so that he reaches his office on time ?

20 kmph

15 kmph

36 kmph

32 kmph

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