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26 Sep 2018, 05:06
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A car completed its first 30 miles of a 60-mile trip at an average speed of 60 miles per hour. At what approximate average speed, in miles per hour, did the car complete the remaining miles to achieve an average speed of 50 miles per hour for the entire 60-mile trip? The car completed its 60-mile trip without a break.
(A) 33
(B) 38
(C) 40
(D) 43
(E) 46
(A) 33
(B) 38
(C) 40
(D) 43
(E) 46
28 Sep 2018, 14:12
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Given 2 equal distances
We can use the shortcut formula
Avg speed = (2*v1*v2)/(v1+v2)
50 = (2*60*v2)/(60+v2)
3,000 + 50v2 = 120v2
3,000 = 70v2
v2 = 3000/70 = 42.8 approximately 43.
Answer choice D
Posted from my mobile device
We can use the shortcut formula
Avg speed = (2*v1*v2)/(v1+v2)
50 = (2*60*v2)/(60+v2)
3,000 + 50v2 = 120v2
3,000 = 70v2
v2 = 3000/70 = 42.8 approximately 43.
Answer choice D
Posted from my mobile device
12 Oct 2018, 19:18
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Salsanousi
Hi, can you please help me understand the formula, please? This formula is great, but I don't really understand the rationale. Thanks in advance!
