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15 Nov 2021, 03:15
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B
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Difficulty:
45%
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Question Stats:
72% (02:29) correct
28%
(02:47)
wrong
based on 254
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Two friends Peter and Michael participated in a 30-mile marathon. Peter takes two hours more than Michael to complete the marathon. If Peter doubles his actual rate, he would take 1 hour less than Michael to complete the marathon. Find Peter's actual rate of running the marathon in miles per hour.
A. 3
B. 5
C. 7.5
D. 8
E. 10
A. 3
B. 5
C. 7.5
D. 8
E. 10
15 Nov 2021, 04:16
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Difference in doubling speed
3 hrs
Option a 30/3-30/6 not possible
Option b 30/5-30/10 possible
Option c 30/7.5- 30/15 not possible
Option d 30/8- 30/16 not possible
Option e 30/10- 30/20
C is right answer
Posted from my mobile device
3 hrs
Option a 30/3-30/6 not possible
Option b 30/5-30/10 possible
Option c 30/7.5- 30/15 not possible
Option d 30/8- 30/16 not possible
Option e 30/10- 30/20
C is right answer
Posted from my mobile device
20 Nov 2021, 04:12
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Two friends Peter and Michael participated in a 30-mile marathon. Peter takes two hours more than Michael to complete the marathon. If Peter doubles his actual rate, he would take 1 hour less than Michael to complete the marathon. Find Peter's actual rate of running the marathon in miles per hour.
S= D/T
Marathon =D= 30 miles
Peter's take 2 more hours than Michael= M+2 hours
>>> S=30/(M+2)
when double the speed>> 2S=30/(M-1) >> S=30/2(M-1)
comparing both S>>>
30/(M+2)=30/2(M-1)
M+2=2M-2
M=4, >> putting in any equation>>
30/(4+2)=5 miles/h
Hence : B
S= D/T
Marathon =D= 30 miles
Peter's take 2 more hours than Michael= M+2 hours
>>> S=30/(M+2)
when double the speed>> 2S=30/(M-1) >> S=30/2(M-1)
comparing both S>>>
30/(M+2)=30/2(M-1)
M+2=2M-2
M=4, >> putting in any equation>>
30/(4+2)=5 miles/h
Hence : B
