How many days are there in a month?

How many hours are there in $2 \mathrm{days}$?

Change $72 \mathrm{hours}$ to days.

Change $4 \mathrm{months}$ to days.

Add:

$7 \mathrm{hours} 44 \mathrm{minutes} \mathrm{and} 1 \mathrm{hours} 31 \mathrm{minutes}$

Manisha spends $4 \mathrm{hours} 30 \mathrm{minutes}$ studying in school and $3 \mathrm{hours} 30 \mathrm{minutes}$ studying at home. So how much time does she spend studying totally?

Pushpa is $1 \mathrm{year} \mathrm{and} 3 \mathrm{months}$ younger than Amit. Amit $1 \mathrm{year} \mathrm{and} 10 \mathrm{months}$ younger to Rashmi. So, how much younger Pushpa than Rashmi?