PayeA264
19.02.2021 •
Mathematics
C(t)= 20+.40(t-60)
t>60
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Ответ:
The rate of boat is 60 kmh.
The rate of current is 5 kmh.
Step-by-step explanation:
Alright, lets get started.
Suppose the rate of boat in still water is : b kmh
Suppose the rate of current is : c kmh
When the boat is going upstream, the relative speed will be :
When the boat is going downstream, the relative speed will be:
Boat travels 220 kilometers in 4 hours going upstream.
It travels 260 kilometers going downstream in the same amount of time.
Adding equation 1 and 2
Plugging the value of b as 60 in equation 2
Hence the rate of boat is 60 kmh.
Hence the rate of current is 5 kmh.
Hope it will help :)