a boy drives at speed 36 mph to work and arrives 15 minutes late. the next day not to be late for work so he drove at 60 mph safe on side arrived 15 minutes earlier he did not want to work more than others find the speed he should go at in mph to arrive correct at time.
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Answer:
45 mph
Step-by-step explanation:
Let the distance travelled be x.
A.T.Q.
Equating time taken in both cases
x/36 - 1/4 = x/60 + 1/4
x - 9/36 = x + 15 / 60
10(x - 9) = 6 ( x + 15 )
10x - 90 = 6x + 90
10x - 6x = 90 + 90
4x = 180
x = 45
Time taken in 1st case :-
45/36 - 1/4
45 - 9 / 36
36 / 36
1
Therefore, speed is 45 mph.
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