Answer:
It takes 20 minutes and 24 seconds more on Friday than that of normal days.
Explanation:
Given:
Average speed on normal days (s₁) = 115 km/h = 71 mi/h
Time taken on normal days (t₁) = 1 hr and 13 min
Average speed on Friday (s₂) = 90 km/h = 56 mi/h
Time taken on Friday (t₂) = ?
Distance covered is same in both case.
Converting time from minutes to hours using the conversion factor, we have:
1 min = hour
∴ 13 min =
So,
Using the distance formula for both the days, we get:
Therefore,
So, time taken on Friday is 1.56 hours.
Time taken on Friday is more and the difference is given as:
Time difference = Time taken on Friday - Time on normal days
Time difference = 1.56 - 1.22 = 0.34 hours
Converting time from hours to minutes using the conversion factor, we have:
1 hour = 60 min
∴ 0.34 hours = 0.34 × 60
= 20.4
= 20 mins + 0.4 mins
= 20 min + (0.4 × 60) = 20 mins + 24 s
So, it takes 20 min and 24 seconds more on Friday than that of normal days.