Question

Convert in second:
2hr 40min 59sec

Answer 1

Hint: We have to find total seconds which are there in 2hr 40min 59sec. First convert 2hr into seconds by using “1hr = 3600sec” and then convert 40 min into seconds by using “1min = 60sec”. Finally all the seconds together to get the answer.

Complete step-by-step answer:

We have to convert 2hr 40min 59sec into seconds.

Let us first convert 2hr into seconds;

We know that 1hr = 3600 seconds

So, by unitary method,

$\begin{align}

  & 2hr=\left( 2\times 3600 \right)\text{seconds} \\

 & \Rightarrow 2hr=7200\text{seconds} \\

\end{align}$

Now, let us first convert 40min into seconds;

We know that 1min = 60 seconds

So, by unitary method,

$\begin{align}

  & 40\min =\left( 40\times 60 \right)\text{seconds} \\

 & \Rightarrow 40\min =2400\text{seconds} \\

\end{align}$

We have converted 2hr into seconds, 40 minutes into seconds and 59 seconds are already into seconds.

And 2hr 40min 59sec in seconds will be equal to the sum of total seconds in 2hr total seconds in 40min and 59 seconds.

(Total seconds in 2hr 40min 59sec) = (Total seconds in 2hr) + (Total seconds in 40min) + 59sec

(Total seconds in 2hr 40min 59sec) = (7200 seconds) + (2400 seconds) + 59sec

2hr 40min 59sec = (7200 + 2400 + 59) seconds

$\Rightarrow $2hr 40min 59sec = 9659 seconds

Hence, 2hr 40min 59sec = 9659 seconds.

Note: Students can make mistakes by not adding 59 seconds in the answer. 2hr and 40 min needs to be converted into seconds but 59 seconds doesn’t need to be converted but it must be added in the answer.