Can the following expressions be used to determine the volume of the rectangular prism in cubic inches? Select Yes or No for eac
h expression.
8
×
6
Choose...
(
2
×
4
)
+
6
Choose...
4
×
(
6
×
2
)
Choose...
2
×
(
4
+
6
)
Choose...
8
×
6
Choose...
(
2
×
4
)
+
6
Choose...
4
×
(
6
×
2
)
Choose...
2
×
(
4
+
6
)
Choose...
1 answer:
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Answer:
Speed of river's current = 5 mph
Step-by-step explanation:
Let 'd' be the distance covered
Let x be the speed of the rivers current
Speed upstream = 15-x
speed downstream = 15+x
Time = distance / speed
time upstream =
time downstream =
the ferry trip upstream takes twice as long as its return trip downstream
=
divide both sides by d
=
cross multiply
Add 2x on both sideds
subtract 15 from both sides and divide by 3
x=5
Speed of river's current = 5 mph