The greatest possible length which can be used to measure exactly the lengths $7 \ m$,$3 \ m \ 85 \ cm$,and $12 \ m \ 95 \ cm$ is .......... $cm$.

Find the greatest number that will divide $390, 495,$ and $300$ without leaving a remainder.

If $A$ and $B$ are the $H.C.F.$ and $L.C.M.$ respectively of two algebraic expressions $x$ and $y,$ and $A+B = x+y,$ then the value of $A^{3}+B^{3}$ is

Three electronic devices make a beep after every $48\, seconds$,$72\, seconds$,and $108\, seconds$ respectively. They beeped together at $10:00\, a.m.$ The time when they will next make a beep together at the earliest is:

Seema,Meena,and Reena start jogging around a circular stadium and complete one round in $54 \text{ seconds}$,$42 \text{ seconds}$,and $63 \text{ seconds}$ respectively. Approximately after how many minutes will they meet again at the starting point?

Find the least number of six digits which is exactly divisible by $15, 21$ and $28$.