Answer: the speed of the current is 9 mph.
Step-by-step explanation:
Let x represent the speed of the current.
A boat can travel 21 mph in still water. If it travels 270 miles with the current. It means that the total speed with which the boat travelled with the current is (21 + x) mph.
Time = distance/speed
Time spent by the boat in travelling 270 miles is
270/(21 + x)
In the same length of time, it travels 108 miles against the current. It means that the total speed with which the boat travelled against the current is (21 - x) mph.
Time = distance/speed
Time spent by the boat in travelling 108 miles is
108/(21 - x)
Since the time is the same, then
270/(21 + x) = 108/(21 - x)
270(21 - x) = 108(21 + x)
5670 - 270x = 2268 - 108x
108x + 270x = 5670 - 2268
378x = 3402
x = 3402/378
x = 9
Answer:
i think its 54. i might be incorrect.
Step-by-step explanation:
Camel back Mountain = 15,168 inches (1,264 feet)
- 1 Penny = 0.061 (.0610) Inches
- 10 Penny = 0.61 (.610) Inches
- 100 Penny = 6.1 (6.10) Inches
- 1,000 Penny = 61 (61.0) Inches
- 10,000 Penny = 610 (610.0) Inches
<u>-SOLVING-</u>
10,000 Penny = 610 inches PLUS
1,000 Penny = 61 inches AND 61 inches x 5 = 305 (5,000 Penny)
100 Penny = 6.1 inches PLUS
10 Penny = 0.61 inches AND 0.61 inches x 6 = 3.66 (60 Penny)
1 Penny = 0.061 inches AND 0.061 inches x 8 = 0.488 (8 Penny)
-<u>FINAL ANSWER-</u>
610 + 305 + 6.1 + 3.66 + 0.488 = 925.248 Penny it would take.
