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23 Jan 2021, 05:32
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E
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
15%
(low)
Question Stats:
86% (01:46) correct
14%
(02:47)
wrong
based on 77
sessions
History
Date
Time
Result
Not Attempted Yet
A motorist travels to a place 170 km away at an average speed of 20 km/h and returns at 30 km/h. His average speed for the whole journey in km per hour is
A. 30
B. 28
C. 26
D. 25
E. 24
A. 30
B. 28
C. 26
D. 25
E. 24
fall2021
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23 Jan 2021, 05:46
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Average speed = 340/((170/20)+(170/30)) = 2*20*30/50 = 24
Option E
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Option E
Posted from my mobile device
23 Jan 2021, 06:50
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we can use matrix method
| speed | Time | Distance
| 20km/h | 170/20 | 170km
| 30km/h | 170/30 | 170km
Therefore- Total Distance/Total Time
170 + 170/ 17/2 + 17/3 = 340/85/6 = 340 * 6/85 =24 Ans
| speed | Time | Distance
| 20km/h | 170/20 | 170km
| 30km/h | 170/30 | 170km
Therefore- Total Distance/Total Time
170 + 170/ 17/2 + 17/3 = 340/85/6 = 340 * 6/85 =24 Ans
