Three bells ring simultaneously at 11a.m. They ring at regular

Severity: Warning

Message: fopen(/var/lib/php/sessions/ci_sessionlp6662ec1nnm7nnofajf0annk2rlspni): failed to open stream: No space left on device

Filename: drivers/Session_files_driver.php

Line Number: 176

Backtrace:

File: /var/www/interviewmania.com/index.php
Line: 315
Function: require_once

Severity: Warning

Message: session_start(): Failed to read session data: user (path: /var/lib/php/sessions)

Filename: Session/Session.php

Line Number: 143

Backtrace:

File: /var/www/interviewmania.com/index.php
Line: 315
Function: require_once

Three bells ring simultaneously at 11a.m. They ring at regular

Home » Aptitude » LCM and HCF » Question

Three bells ring simultaneously at 11a.m. They ring at regular intervals of 20 minutes, 30 minutes, 40 minutes respectively. The time when all the three ring together next is

LCM of 20, 30 and 40 minutes = 120 minutes
Hence, the bells will toll together again after 2 hours i.e. at 1 p.m.
Required time = 1 p.m.