A father and his son..........

LALIT KUMAR · 01-01-07, 03:49 PM

19. A father and his son go out for a 'walk-and-run' every morning around a track formed by an equilateral triangle. The father's walking speed is 2 mph and his running speed is 5 mph. The son's walking and running speeds are twice that of his father. Both start together from one apex of the triangle, the son going clockwise and the father anti-clockwise. Initially the father runs and the son walks for a certain period of time. Thereafter, as soon as the father starts walking, the son starts running. Both complete the course in 45 minutes. For how long does the father run? Where do the two cross each other?

LALIT KUMAR · 18-01-07, 12:24 PM

solve the above questions in the steps only

romeovictor04 · 24-06-07, 01:57 AM

the father runs for 40 min, walks for 5 min
totally they walks/runs a distance of 3.5 mile, crosses after 23 min 20 sec. after father has covered 1.99 miles

RV

01-01-07, 03:49 PM	#1 (permalink)
LALIT KUMAR Senior Member Join Date: Oct 2006 Location: new delhi Posts: 183 Thanks: 21 Thanked 5 Times in 5 Posts Thanks: 21 Thanked 5 Times in 5 Posts Rep Power: 3	A father and his son.......... 19. A father and his son go out for a 'walk-and-run' every morning around a track formed by an equilateral triangle. The father's walking speed is 2 mph and his running speed is 5 mph. The son's walking and running speeds are twice that of his father. Both start together from one apex of the triangle, the son going clockwise and the father anti-clockwise. Initially the father runs and the son walks for a certain period of time. Thereafter, as soon as the father starts walking, the son starts running. Both complete the course in 45 minutes. For how long does the father run? Where do the two cross each other? __________________ Lalit Kumar 09914097899

18-01-07, 12:24 PM	#2 (permalink)
LALIT KUMAR Senior Member Join Date: Oct 2006 Location: new delhi Posts: 183 Thanks: 21 Thanked 5 Times in 5 Posts Thanks: 21 Thanked 5 Times in 5 Posts Rep Power: 3	Re: A father and his son.......... solve the above questions in the steps only __________________ Lalit Kumar 09914097899

24-06-07, 01:57 AM	#3 (permalink)
romeovictor04 Member Join Date: Jun 2007 Location: kochi, kerala, india Age: 27 Posts: 31 Thanks: 1 Thanked 0 Times in 0 Posts Thanks: 1 Thanked 0 Times in 0 Posts Rep Power: 2	Re: A father and his son.......... the father runs for 40 min, walks for 5 min totally they walks/runs a distance of 3.5 mile, crosses after 23 min 20 sec. after father has covered 1.99 miles RV Last edited by romeovictor04; 24-06-07 at 02:03 AM.

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