Each of the four sons can cross the bridge in time, namely 3, 7, 13, and 17 minutes, respectively, Only two people can cross at a time, What is the minimum time in which all four can cross the bridge?
Maths / Average MCQs Math — Multiple-choice practice
چاروں بیٹوں میں سے ہر ایک پل کے وقت کو عبور کر سکتا ہے، یعنی بالترتیب 3، 7، 13، اور 17 منٹ، ایک وقت میں صرف دو لوگ ہی کراس کر سکتے ہیں، کم از کم کتنا وقت ہے جس میں چاروں پل عبور کر سکتے ہیں؟
- A. 27 minutes
- B. none
- C. 20 minutes
- D. 23 minutes
Correct answer
20 minutes
Explanation
Explanation First, send 17 and 7. After 7 minutes, 7 is at finish and 17 needs 10 more minutes to complete his travel. now send 13. After 10 minutes 17 reaches finish and 13 needs 3 more minutes to complete. now send 3. Both 3 and 13 reach the destination at the same time after 3 minutes. hence the time taken is 7+10+3 = 20 minutes. ND-21-5-2023
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