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Question

A person usually covers a certain distance in one hour. How much time will he be able to save if he increases his speed by 25% to cover the same distance?

एक व्यक्ति सामान्यतः एक घंटे में एक निश्चित दूरी तय करता है। यदि वह उसी दूरी को तय करने के लिए अपनी गति 25% बढ़ा देता है, तो वह कितना समय वचा पाएगा?

A
12 min

12 मिनट
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B
18 min

18 मिनट
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C
16 min

16 मिनट
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D
20 min

20 मिनट
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Solution

The correct option is A 12 min

12 मिनट
Let the usual speed of the person be ‘s’ and the time saved by him in the event of increased speed be ‘t’ min respectively.
S × 1 = 1.25 s × (1t60)
t=12

माना कि क्रमश: व्यक्ति की सामान्य गति ‘s’ है और उसके द्वारा चलने की बढ़ी हुई गति के कारण बचाया गया समय ‘t’ मिनट है।
S × 1 = 1.25 s × (1t60)
t=12

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