X goes to office at 2½-km per hour and arrives 12 minute late. The next day he walks at 4 kmph
and reaches office 15 minutes before time. Find the distance from his office to home?
Ans is 3 km
plz give the process
Answers
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Answer:
Time = 3 hours
Step-by-step explanation:
speed 1 = 2½-km per hour
distance travelled = x KM
Time - t1 hour
speed = Dist / Time
5/2 = x/t1
t1 = 2x/5
-------------------------
speed 2 = 4 kmph
distance travelled = x KM
Time - t2 hour
speed = Dist / Time
4 = x/t2
t2 = x/4
-------------------------------------------------
Difference between t1 & t2 is 12 + 15 = 27 minutes = 27/60 hours
t1 - t2 = 27/60
2x/5 - x/4 = 27/60
(8x - 5x)/20 = 27/60
3x = 9
x = 3 hours
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