Advertisement

Updated April 20th, 2020 at 21:48 IST

'Four friends A B C D need to cross bridge' Whatsapp puzzle & answer with solution inside

'Four friends A B C D need to cross bridge' is a trending puzzle that is doing the rounds on Whatsapp groups these days. Read on to know the answer.

Reported by: Anushka Pathania
four friends a b c d need to cross bridge
| Image:self
Advertisement

The Coronavirus pandemic has held the world in its clasp. The number of people getting affected by it has been increasing exponentially despite the world being in lockdown and people being forced to stay indoors. In this tough time, people have resorted to social media to keep in touch with their friends and family. There has been a rising trend among the people to send each other puzzles and quizzes to keep each other entertained and share laughter during these tough times. One such puzzle that has been doing the rounds on social media is a series of riddles about 4 friends who need to cross a bridge. Given below is the question along with its answer and explanation.

Read | '1 To 9 All Digits To Be Used' Whatsapp Puzzle With Answer And Solution Inside

Question

Four friends A, B, C and D need to cross a bridge. A maximum of two persons can cross it at a time. It is night and they just have one lamp. Persons that cross the bridge must carry the lamp to find the way. A pair must walk together at the speed of a slower person. After crossing the bridge, the person having faster speed in the pair will return with the lamp each time to accompany another person in the group. Finally, the lamp has to be returned at the original place and the person who returns the lamp has to cross the bridge again without a lamp. To cross the bridge, the time taken by them is as follows: A: 1 minute, B: 2 minutes, C: 7 minutes and D: 10 minutes. What is the total minimum time required by all the friends to cross the bridge?

(a) 23 minutes 

(b) 22 minutes 

(c) 21 minutes  

(d) 20 minutes

Read | Good News: Five Positive Stories To Help You Fight COVID-19 'lockdown Blues'

Answer: (a) 23 minutes

Solution

Here, A takes the shortest time to cross the bridge i.e. 1 min. And, D takes 10 min, C takes 7 min and B takes 2 min to cross the bridge.

So 4 friends can cross the bridge in minimum time in the following ways.

 A + B crossing and A returning : (2 + 1) min 2. A + C crossing and A returning : (7 + 1) min 3.

A + D crossing and A returning : (10 + 1) min 4.

A crossing the bridge for the last time: 1 min.

Hence, total minimum time = 3 + 8 + 11 + 1 = 23 min.

Read | Video Of Man Launching Rocket Crackers From His Hand Leaves Netizens Divided

Read |Qatar’s Philharmonic Orchestra Performs From Balconies To Cheer Residents Amid Lockdown

Image Credits: Shutterstock

Advertisement

Published April 20th, 2020 at 21:48 IST

Your Voice. Now Direct.

Send us your views, we’ll publish them. This section is moderated.

Advertisement
Advertisement

Trending Quicks

BREAKING: Mukhtar Ansari Suffers Heart Attack, Admitted to Hospital in Serious Condition
a few seconds ago
Jailed Gangster Mukhtar Ansari Passes Away
a few seconds ago
Man Detained With Liquor Bottle Outside Court When Arvind Kejriwal Produced In Excise Policy Case
3 minutes ago
Experience The Magic Of These Kashmiri Lakes
3 minutes ago
Penn Badgley
6 minutes ago
Ravichandran Ashwin and MS Dhoni
11 minutes ago
Superfoods
14 minutes ago
MS Dhoni lifting Ravindra Jadeja after IPL 2023 victory
20 minutes ago
नाबालिग से गैंगरेप
22 minutes ago
Rain tax to be imposed in Canada from April
30 minutes ago
Advertisement
Advertisement
Advertisement
Whatsapp logo