An airplane travels a specific distance at a speed of 240 km/h over the course of 5 hours. To cover the same distance in just 1 h…

Question

An airplane travels a specific distance at a speed of 240 km/h over the course of 5 hours. To cover the same distance in just 1 hour, it needs to fly at a speed of:

1. A. 1200 km/h (Correct answer)
2. B. 1500 km/h
3. C. 1400 km/h
4. D. 1600 km/h

Correct Answer

Option A — 1200 km/h

Detailed Solution & Explanation

The correct answer is 1200 km/h.

Key Points

• Find the distance first: 240 km/h × 5 hours = 1,200 km.
• To cover the same 1,200 km in 1 hour, the required speed is 1,200 ÷ 1 = 1,200 km/h.

Additional Information

• Speed and time are inversely proportional for a fixed distance: cutting the time to one-fifth multiplies the required speed by five, and 240 × 5 = 1,200 reaches the answer in one step.
• That inverse relationship is the basis of most speed-time questions: if the ratio of speeds is a : b, the ratio of times for the same distance is b : a.
• Keep the three forms fluent: D = S × T, S = D / T, T = D / S, and check that the units of speed and time correspond before multiplying.

प्रश्न (हिन्दी में)

एक हवाई जहाज 5 घंटे में 240 किमी/घंटा की गति से एक निश्चित दूरी तय करता है। उसी दूरी को सिर्फ 1 घंटे में तय करने के लिए, उसे इस गति से उड़ना होगा:

1. A. 1200 किमी/घंटा
2. B. 1500 किमी/घंटा
3. C. 1400 किमी/घंटा
4. D. 1600 किमी/घंटा