When looking for distance you multiply speed by time
So 15 x 2 = 30
30 is the distance between his house and school
Answer:
If she stands on the North side of a river flowing to the East at 5 mph,
she must head towards the SouthWest to arrive on the South side of the river directly across from her starting point and we have
x^2 + 5^2 = 10^2 where x is her speed directly across the river
x = (75)^1/2 = 8.66 mph towards the South
sin theta = 5 / 10 = 1/2
She must angle the boat at 30 deg from straight South
The most waste is Yucca mtn. in Nevada
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I would say clay, because its a solid