Multiple choice

Two cars start from the same place at the same time at right angles to each other. Their speeds are 54 km/h and 72 km/h, respectively. After 20 seconds, the distance between them will be: दो कारें एक ही स्थान से एक ही समय पर एक दूसरे से समकोण पर चलना शुरू करती हैं। इनकी गति क्रमशः 54 किमी/घंटा और 72 किमी/घंटा है। 20 सेकंड के बाद, उनके बीच की दूरी होगी:

  1. 480 m 480 मीटर

  2. 540 m 540 मीटर

  3. 720 m 720 मीटर

  4. 500 m 500 मीटर

  5. 750 m 750 मीटर
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D Correct answer
Explanation

Cars move at right angles, so distance forms hypotenuse of right triangle. Speeds: 54 km/h = 15 m/s, 72 km/h = 20 m/s. In 20 seconds: distances traveled are 300 m and 400 m. Distance between them = sqrt(300² + 400²) = sqrt(90000 + 160000) = sqrt(250000) = 500 m. This is a 3-4-5 triangle (300, 400, 500).

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