Let x be the speed of the boat in still water and y be the speed of the current of the river.
The downstream speed will be x+y, the upstream speed will be x-y.
but:
distance=speed*time
therefore; as the boat travels in 2 hours downstream we shall have:
2(x+y)=48......i
and as the boat travels upstream we shall have:
3(x-y)=48........ii
simplifying i and ii we get:
x+y=24....iii
x-y=16....iv
adding the above iii and iv we get
2x=40
x=40/2=20
substituting x=20 into iii we obtain:
20+y=24
y=24-20
y=4
so the speed of the boat in still waters is 20 miles per hour
the rate of the stream is 4 miles per hour
Answer:
The percent error of Jocelyn's estimate is 2.14 .
Step-by-step explanation:
Formula
Where
As given
Jocelyn estimates that a price of wood measures 5.5 cm.
If it actually measures 5.62 cm.
approx value = 5.5 cm
exact value = 5.62 cm
Put in the error formula
error = 0.12
Put in the formula
Percentage error = 2.14 (Approx)
Therefore the percent error of Jocelyn's estimate is 2.14 .
Answer: It would be $3.75
Step-by-step explanation: 12/2=6 and 7.50/2=3.75
Your answer is 21 for this one.
