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14 Aug 2018, 02:36
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C
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100% (01:08) correct
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wrong
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Responding to a pm:
A man travels 35 km partly at 4 km/h and at 5km/h. If he covers former distance at 5 km/h and later at 4 km/h, he could cover 2 km more in the same time. The time taken to cover the whole distance at original rate is?
(a) 4.5
(b) 7
(c) 8
(d) 9
A man travels 35 km partly at 4 km/h and at 5km/h. If he covers former distance at 5 km/h and later at 4 km/h, he could cover 2 km more in the same time. The time taken to cover the whole distance at original rate is?
(a) 4.5
(b) 7
(c) 8
(d) 9
I know the total distance is 35 km. Some of this was covered at 4km/hr and some at 5 km/hr so average speed would be somewhere in between 4 and 5 km/hr.
Let's get the range of the time taken.
If the entire distance were covered at 4 km/hr, time taken would be 35/4 = 8.75 hrs
If the entire distance were covered at 5 km/hr, time taken would be 35/5 = 7 hrs
So time taken is actually in between these two values (since average speed is between 4 and 5).
Note that only option (C) lies in between these two values.
Answer (C)
Let's get the range of the time taken.
If the entire distance were covered at 4 km/hr, time taken would be 35/4 = 8.75 hrs
If the entire distance were covered at 5 km/hr, time taken would be 35/5 = 7 hrs
So time taken is actually in between these two values (since average speed is between 4 and 5).
Note that only option (C) lies in between these two values.
Answer (C)
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25 Apr 2021, 23:15
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