Question

When a new bridge is built, the average time taken by a bus to travel from one city to another is reduced from 50 minutes to 40 minutes. What is the percentage decrease in time taken to travel between two cities.​

Answer 1

Previous time=50mins

New time=40 mins

Decrease=50mins-40mins=10mins

Therefore decrease percent=

$\frac{10}{50} \times 100\% \\ = 20\%$

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Answer 2

Given - Original and final time - 50 and 40 minutes respectively

Find - Percentage decrease in time taken

Solution - Percentage decrease in time taken to travel between two cities can be calculated by the formula given below -

Percentage decrease = old value - new value/old value * 100

Thus calculating percentage decrease by keeping the values in formula -

Percentage decrease = 50 - 40/50*100

Firstly performing subtraction -

Percentage decrease = 10/50*100

Now, cancelling zero and performing division -

Percentage decrease = 20%

Hence, percentage decrease in time taken is 20%.