1) as we know , in period of 12 hours , angle of 180 , (oppostie min hand and hour hand ) happens exactly 11 times ...

so here we have to calculate from 4pm on monday to subsequence wednesday 10am .

now from 4pm monday to 4 pm tuesday it will be 24 hr so angle of 180 will make 22 times .now from 4pm tuesday to 10 am wednesday 12 hr +6 hr = 11+5times = 16 times

so total 22+16= 38...

2) at 6am fast 8min and 12 at noon 4 min late

relatively 12 mins difference in 6 hr so in 1 min difference 1/2 hr , so clock will cover 8mins in 8*1/2= 4hr .. so correct time will be show at 10 am ..

3) in 1 min second hand cover 360 degree . so 900 degree will 90/36 min ,

as we know hour hand in 1 min cover half degree , so in 90/36 min = 1.25 degree ...