Amit's speed = 10 km/hr
Time for 1 km:
Time =SpeedDistance
=101 hour
=101×60
=6 minutes per km
Distance to cover = 5 km
Walking time =5×6
=30 minutes
After 1st km → Rest
After 2nd km → Rest
After 3rd km → Rest
After 4th km → Rest
After 5th km → Destination reached (no rest)
Number of rests =4
Rest time =4×5
=20 minutes
Total time = Walking time + Rest time
=30+20
=50 minutes