If Mary cycles at 9 kilometre per hour, she reaches the school late by 5 minutes. If she cycles cycles at 12 kilometre per hour, she reaches the school 3 minute early. What is the distance of the school from her house?
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Answers
Answered by
3
Step-by-step explanation:
If Mary cycles at 9 kilometre per hour, she reaches the school late by 5 minutes. If she cycles cycles at 12 kilometre per hour, she reaches the school 3 minute early. What is the distance of the school from her house?
Answered by
3
Step-by-step explanation:
speed = 9 km/ hr
t = distance/speed
t= x/9
again s2= 12 km/hr
t2 = x/12
A. T. Q
converting min into hr
x/9 -5/60= x/12+3/60
which means if she reaches 5 minutes early so she can reach the distance on time and same if she reaches 3 min later she reaches the distance on time.
x/9-x/12 = 3/60+5/60
12x -9x /108= 8/60
3x/108 = 8/60
simplified
x=8×36/60= 48/10= 4.8 km
hope this is useful
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