Answer:
6.93 km/h
Explanation:
To calculate her average speed, we need the "speed" formula, which is:
average speed = distance / time
You plug in your numbers and it will give you the answer.
Speed = 4.5km/0.65hr
= 6.923 km/h
Answer:
Time = 2758.62 seconds
Explanation:
Given the following data;
Speed = 290 m/s
Distance = 800 km to meters = 800 * 1000 = 800000
To find the time;
Time = distance/speed
Time = 800000/290
Time = 2758.62 seconds
Therefore, it will take the pilot 2758.62 seconds to reach the airport.
Divide 2500 g by 500 cc. The quotient is 5 g/cc ... the density.
Answer:
a) speed of water relative to shore = 0.85 m/s
b) speed of each canoe relative to the water = 2.05 m/s
Explanation:
Let the speed of the canoeists be 'v'
and,
the speed of stream relative to shore be 'u'
therefore,
for the canoeist padding upstream
u - v = - 1.2 m/s .............(1)
and,
for the canoeist padding downstream
u + v = 2.9 m/s .............(2)
on adding equation (1) and (2), we get
u - v = - 1.2
+ u + v = 2.9
===========
2u + 0 = 1.7
or
u = 0.85 m/s
substituting u in equation 2 we get
0.85 + v = 2.9
or
v = 2.05 m/s
Hence,
a) speed of water relative to shore = 0.85 m/s
b) speed of each canoe relative to the water = 2.05 m/s
