Question

Walking at 3/4 of his usual pace, a man reaches his office 20 minute late. Find his usual time?

Answer 1

Answer:

60 minutes

Step-by-step explanation:

Let s = his normal speed

t = his normal time

Then

D = (3/4)s * (t+20)

Since the distance is the same we can equate this to his regular day which is D = s*t

s*t = (3/4)s * (t+20)

st = 3st/4 + 15s

st/4 = 15s

t = 60 minutes