Multiple choice

The difference between the times taken by the two cars to travel a distance of 350 km is 2 hours 20 minutes. If the difference between their speeds is 5 kmph, find the faster speed. दो कारों द्वारा एक 350 किमी. की दूरी को तय करने में लगे समय का अन्तर 2 घंटे और 20 मिनट है | यदि उनकी चालों का अनुपात 5 किमी./घंटा है, तेज चाल ज्ञात कीजिये |

  1. 35

  2. 30

  3. 25

  4. 20
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Let the faster speed be s kmph. The slower is s - 5 kmph. Time difference is 350/(s - 5) - 350/s = 7/3 hours. Solving: 350(5)/(s² - 5s) = 7/3, giving s² - 5s = 750, so s = 30 kmph.

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