Five bells begin to toll together and toll at intervals of 36, 45, 72, 81 and 108 seconds. After what interval of time will they keep on tolling together ?
In following question , a number series is given with one term missing. choose the correct alternative that will same pattern and fill in the blank space.1,6,15,45,66,91
It is observed that the total pressure exerted by air on the man of average size is around 14.7 lb wt. per square inch. but the man feels quite comfortable .it is because of: