Question

At what time is the cake done

Answer 1

Explanation:

Here we know that at 3:17 pm you started to bake the cake. The total revolution the minute hand on the clock makes is:

$\frac{5}{8}+\frac{13}{24}=\frac{7}{6} \ revolutions$

We know that:

$1 \ revolution ----------- 60min \\ \\ 7/6 \ revolutions -----------x$

Solving for x:

$x=\frac{7}{6}\times 60=70 minutes$

So it takes 70 minutes after you put the cake in the oven. But:

$70minutes=1h \ 10min$

Adding this to the initial time:

$3:17pm+1h \ 10min=4:27pm$

Finally, the cake is done at 4:27 pm, option C.