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27 Jan 2021, 03:30
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A
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
5%
(low)
Question Stats:
91% (01:06) correct
9%
(02:09)
wrong
based on 86
sessions
History
Date
Time
Result
Not Attempted Yet
For the 1st 3 hrs. of his journey, Ramesh drove at 50kms per hour. Then, due to construction delays, he drove at only 40 km/h for the next 2 hrs. what was his average speed in km/h, for entire trip ?
(A) 46
(B) 48
(C) 50
(D) 52.5
(E) 53
(A) 46
(B) 48
(C) 50
(D) 52.5
(E) 53
27 Jan 2021, 03:56
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Hours Speed Distance
1 3 50 150
2 2 40 80
Total 5 46 230
1 3 50 150
2 2 40 80
Total 5 46 230
31 Jan 2021, 05:55
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Solution
Given
In this question, we are given that
- • For the first 3 hours of his journey, Ramesh drove at 50 kmph.
• For the next 2 hours, he drove at 40 kmph.
To find
We need to determine
- • Ramesh's average speed.
Approach and Working out
Average speed = Total distance × Total time
- • First leg of the journey
- o Time = 3 hours
o Speed = 50 kmph
- So, distance = 3 × 50 = 150 miles
• Second leg of the journey
- o Time = 2 hours
o Speed = 40 kmph
- So, distance = 2 × 40 = 80 miles
• Hence, average speed = (150 + 80)/(3 + 2)
- o = 230/5
o = 46 kmph
Thus, option A is the correct answer.
Correct Answer: Option A
