Question

Andy calculated that it will take 45 min to cover a distance of 60 km by his car. How long will it take to cover the
same distance if the speed of his car is reduced by 20 km/h?
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Answer 1

ANSWER

1 Hours

Step-by-step explanation:

Time=45min

Distance=60km

1 hour = 60 m

45m=45/60=0.75

S=D/T = 60/0.75 = 80 km/h

If speed is reduced by 20km/h

so, 80km/h - 20km/h = 60km/h

T=D/S = 60/60 = 1 HOURS

Answer 2

Given - Time = 45 min

Distance = 60 km

Reduced speed = 20 km/h

Find - New time taken to cover the same distance

Solution - Firstly find out the original speed of the car. Converting time in minutes to hours.

As we know, 60 minutes is 1 hour.

So, 45 minutes will be = 45/60

45 minutes = 0.75 hour

Now, finding out the original speed by the formula: speed = distance/time

Speed = 60/0.75

Speed = 80 kilometres/hour

Now, the new speed is reduced by 20 kilometres/hour. So, new speed = 80 - 20

New speed = 60 kilometres/hour

New time taken = distance/speed

The new time taken = 60/60

The new time taken = 1 hour

Hence, after reducing the speed, the time taken will be 1 hour to cover the same distance.