The traffic lights at three different signal points change after every $45$ seconds, $75$ seconds and $90$ seconds respectively. If all change simultaneously at $7 : 20 : 15$ hours, then they will change again simultaneously at

7 : 27 : 50

hours

No worries! We‘ve got your back. Try BYJU‘S free classes today!

7 : 27 : 45

hours

Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses

7 : 28 : 00

hours

No worries! We‘ve got your back. Try BYJU‘S free classes today!

7 : 27 : 30

hours

No worries! We‘ve got your back. Try BYJU‘S free classes today!

Open in App

Solution

The correct option is B $7 : 27 : 45$ hours
LCM of $45, 75$ and $90 = 450$ seconds.
i.e. $7$ minutes $30$ seconds.
$∴$ Required time $= 7 : 27 : 45$ hours.

Suggest Corrections

Similar questions

Q. The traffic lights at three different road crossing change after every 48 seconds, 72 seconds and 108 seconds respectively. If they all change simultaneously at 8 hours, then at what time will they again change simultaneously?

Q. There are three consecutive road crossings at which traffic lights change after every 48 seconds 72 seconds and 108 seconds respectively If the lights change simultaneously at 8 : 20 : 00 hours then at what time will they change again simultaneously?

Question 6

The traffic lights at three different road crossings change after every $48$ seconds, $72$ seconds and $108$ seconds respectively. If they change simultaneously at $7$ a.m., at what time will they change simultaneously again?

Q. The traffic lights at three different road crossings change every

24

seconds,

36

seconds, and

72

seconds respectively. If they all change simultaneously at

8 : 20 : 00

a.m., then they will again change simultaneously at

The traffic signals at 3 different road crossing chages after evry 48 s,72s,and 108s respectively.If they all change simultaneously at 8 hours, then what time will they again change simultaneously?

Join BYJU'S Learning Program

The traffic lights at three different signal points change after every 45 seconds, 75 seconds and 90 seconds respectively. If all change simultaneously at 7:20:15 hours, then they will change again simultaneously at

The correct option is B 7:27:45 hoursLCM of 45,75 and 90=450 seconds.i.e. 7 minutes 30 seconds.∴ Required time =7:27:45 hours.

The traffic lights at three different signal points change after every $45$ seconds, $75$ seconds and $90$ seconds respectively. If all change simultaneously at $7 : 20 : 15$ hours, then they will change again simultaneously at

The correct option is B $7 : 27 : 45$ hours
LCM of $45, 75$ and $90 = 450$ seconds.
i.e. $7$ minutes $30$ seconds.
$∴$ Required time $= 7 : 27 : 45$ hours.