Four different electronic devices make a beep after every 30 minutes, 1 hour, `1 1/2` hour and 1 hour 45 minutes respectively. All the devices beeped together at 12 noon. They will again beep together at (a) 12 midnight (b) 3 a.m. (c) 6 a.m. (d) 9 a.m.

An electronic divice makes a beep after every 15 minutes , Another device makes a beep after every 20 minutes. They beeped together at 6 a.m., at what time will they next beep together ?

An electronic device makes a beep after every 60 sec. Another device makes a beep after every 62 sec. They beeped together at 10 a.m. The next time, when they would beep together at the earliest is (a) 10.30 a.m. (b) 10.31 a.m. (c) 10.59 a.m. (d) 11 a.m.

An electronic device makes a beep after every 60 seconds. Another device makes a beep after every 62 seconds. They beeped together at 10 a.m . At what time will they beep together at the earliest ?

The bells of three Churchs ring on the interval of 10, 12 and 15 minute respectively. If those ring at 8:30 A.M. together, then when will those ring next time together?

Three electronic devices make a beep after every 48 sec, 72 sec and 108 sec respectively. They beeped together at 10 a.m. The time when they will next make a beep together at the earliest is तीन इलेक्ट्रोनिक यंत्र प्रत्येक क्रमश: 48 सैकेंड, 72 सैकेंड और 108 सैकेंड के बाद बजते है। वे तीनों एक साथ पूर्वाहन 10 बजे बीप करते है। वह समय बताए जब वे अगली बार एक साथ बजेंगं?

In a shop. There are three clocks which chime at intervals of 15,20 and 30 minutes respectively. They all chimetogether at 10 a.m. At what time will they all chime together again ?