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01 Mar 2023, 22:41
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E
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Difficulty:
15%
(low)
Question Stats:
89% (02:25) correct
11%
(03:22)
wrong
based on 65
sessions
History
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Jamie drives for X kilometers at a uniform speed of 50 km/hour, then increases his speed to 75 km/hour and travels for 2X kilometers, and finally travels at 40 km/hour for the remainder of the journey. If the total distance travelled is 100 km, find his approximate average speed for the journey.
A) 55 km/hour
B) 50 km/hour
C) 45 km/hour
D) 40 km/hour
E) It cannot be determined from the information given
A) 55 km/hour
B) 50 km/hour
C) 45 km/hour
D) 40 km/hour
E) It cannot be determined from the information given
02 Mar 2023, 00:06
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I believe it cannot be determine because we do not know the distance of the last leg of 40/hr.
Therefore E
Therefore E
04 Mar 2023, 08:09
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Given: Jamie drives for X kilometers at a uniform speed of 50 km/hour, then increases his speed to 75 km/hour and travels for 2X kilometers, and finally travels at 40 km/hour for the remainder of the journey.
Asked: If the total distance travelled is 100 km, find his approximate average speed for the journey.
Total Distance = 100 kms
Time taken = X/50 + 2X/75 + (100-3X)/40
Average speed = 100 / ( X/50 + 2X/75 + (100-3X)/40 )
Which is dependent on the value of X.
IMO E
Asked: If the total distance travelled is 100 km, find his approximate average speed for the journey.
Total Distance = 100 kms
Time taken = X/50 + 2X/75 + (100-3X)/40
Average speed = 100 / ( X/50 + 2X/75 + (100-3X)/40 )
Which is dependent on the value of X.
IMO E
