Answer: 1 & 8/11 hours
This approximates to about 1.72727 hours
Work Shown
speed = 10 & 1/10 km per hr = 1.1 km per hr
distance = 1 & 9/10 km = 1.9 km
time = distance/speed
time = (1.9 km)/(1.1 km per hr)
time = 19/11 hours
time = (11+8)/11 hours
time = (11/11 + 8/11) hours
time = 1 & 8/11 hours
time = 1.72727 hours approximately
The "72" portion repeats forever, but we have to round at some point. Round however your teacher instructs.