Answer:
Speed of train = 60 km/hr
Speed of plane = 160 km/hr
Explanation:
We can construct the following equations from the given information:
Speed of train * time = 150 -Equation 1
Speed of plane * time = 400 -Equation 2
Speed of plane = (3 * Speed of train) - 20 -Equation 3
We can solve these three simultaneous equations for the three variables (speed of train , speed of plane, time).
Substituting within Eq. 1 and Eq. 2 we get:
Speed of plane * 150 = 400 * Speed of train -Equation 4
Finally, solving Eq. 4 and Eq. 3 simultaneously we get:
Speed of train = 60 km/hr
Speed of plane = 160 km/hr
I live in the city. It's always warmer in the city, compared to other areas, even at night. Why is that?
A.) The rain shadow effect makes surrounding areas cool and moist and the city warm and dry.
B.) Buildings absorb and retain heat from the Sun, producing the urban heat island effect.
C.) Lake effect snow only affects areas outside of the city.
D.) The city receives lake effect snow.
B. 5 ft
C. 35 ft
D. 25 ft