Answer:
The time taken is 
Explanation:
From the question we are told that
The length of the speed ramp is 
The speed of the speed ramp is 
The time taken to cover the distance is 
The walking speed( when not on the speed ramp) required to cover the 104m is mathematically represented as

Substituting values


The speed required to cover the 104m distance when on a speed speed ramp is mathematically represented as

substituting values


Now the time taken to travel the 104m distance when walking on the speed ramp is mathematically evaluated as



Answer:
one of the reasons is that it wets the glass thermometer it also doesn't detect slight changes in temperature of the atmosphere it has a high boiling point I don't know the rest
The answer to the question is (C)
Hope this helps :)