- Boat Speed A boat on a river travels downstream betweentwo points, 20 mi apart, in 1 h. The return trip against thecurrent takes 2 h. What is the boat's speed, and how fastdoes the current in the river flow?сurrent20 mi

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Answered: - Boat Speed A boat on a river travels…

College Algebra

7th Edition

ISBN:9781305115545

Author:James Stewart, Lothar Redlin, Saleem Watson

Publisher:James Stewart, Lothar Redlin, Saleem Watson

Chapter5: Systems Of Equations And Inequalities

Section5.1: Systems Of Linear Equations In Two Variables

Problem 66E

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Similar questions

Airplane Speed A man flies a small airplane from Fargo to Bismarck. North Dakota-a distance of 180 mi. Because is flying into a headwind, the trip takes him 2 h. On way back, the wind is still blowing at the same speed, so the return trip takes only 1h 12 min. What is his speed in still air, and how fast is the wind blowing?
Distance and Time Anthony leaves Kingstown at 2:00 P.M. and drives to Queensville, 160 mi distant, at 45 mi/h. at 2:15 P.M. Helen leaves Queensville and drives to Kingstown at 40 mi/h. At what time do they pass each other on the road?
Navigation A ship is 2.8 off course. If the ship is traveling at 14.0 miles per hour, how far off course will it be after 2 hours?
Sound Location You and a friend live 4 miles apart. You hear a clap of thunder from lightning 18 seconds before your friend hears it. Where did the lightning occur? (Assume sound travels at 1100 feet per second.)
Shadow Length A person who is 6 feet tall walks away from a 50-foot tower toward the tip of the tower’s shadow. At a distance of 32 feet from the tower, the person’s shadow begins to emerge beyond the tower’s shadow. How much farther must the person walk to be completely out of the tower’s shadow?
The Skydiver Again When a skydiver jumps from an airplane, her downward velocity, n feet per second, before she opens her parachute is given by = 176 1 0.834t, where t is the number of seconds that have elapsed since she jumped from the airplane. We found earlier that the terminal velocity for the skydiver is 176 feet per second. How long does it take for her to reach 90 of terminal velocity?
Distance A boy is riding his motorcycle on a road that runs east and west. He leaves the road at a service station and rides 5.25 miles in the direction N 15.5 E. Then he turns to his right and rides 6.50 miles back to the road, where his motorcycle breaks down. How far will he have to walk to get back to the service station?
Falling-Body Problems Suppose an object t dropped from a height h0 above the ground. Then its height after t seconds is given by h=16t2+h0 , where h ¡s measured in feet. Use this information Lo solve the problem. If a ball is dropped from 288 ft above the ground, how bug does it take to reach ground level?
APPLICATIONS Height of Tree A woodcutter determines the height of a tall tree by first measuring a smaller one 125 ft away, then moving so that his eyes are in a line of sight along the tops of the trees and measuring how far he is standing from the small treesee the figure. Suppose the small tree is 20 ft. tall, the man is 25 ft. from the small tree, and his eye level is 5 ft. above the ground. How tall the taller tree?
Radio Waves Radio waves travel at the same speed as light, approximately 3.0108 meters per second. Find the time required for a radio wave to travel from Mission Control in Houston to NASA astronauts on the surface of the moon 3.84108 meters away.
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- Boat Speed A boat on a river travels downstream between two points, 20 mi apart, in 1 h. The return trip against the current takes 2 h. What is the boat's speed, and how fast does the current in the river flow? сurrent 20 mi