An express train travelled at an average speed of 100 km/hr, after every 80 km it stops for 2 minutes How long did it take to reach its distinction 700 km from the starting point ?

Total  distance = 700 kms

Total speed = 100 kmph

$\therefore Time=\frac{\text{distance}}{speed}\Rightarrow \frac{700kms}{100kmph}=7hrs$

No. of stops one multiples of 80 less than 700

There are 80, 160,  240,  320, 400, 480, 560, 640 total 8 steps

$\therefore$ Time taken for every stop $8\times 2\text{\hspace{0.17em}\hspace{0.17em}mins}=16\text{\hspace{0.17em}\hspace{0.17em}mins}$

$\therefore \text{\hspace{0.17em}\hspace{0.17em}Total\hspace{0.17em}\hspace{0.17em}time\hspace{0.17em}\hspace{0.17em}taken\hspace{0.17em}\hspace{0.17em}=\hspace{0.17em}\hspace{0.17em}7\hspace{0.17em}\hspace{0.17em}hrs\hspace{0.17em}+16\hspace{0.17em}\hspace{0.17em}mins}$

$\text{=\hspace{0.17em}\hspace{0.17em}7\hspace{0.17em}hrs\hspace{0.17em}\hspace{0.17em}16\hspace{0.17em}\hspace{0.17em}mins}$