233k views
1 vote
A car's speed is 60 km/h. By how much would it have to increase its speed to be able to cover each kilometer of the road by half a minute faster?

User Caesium
by
7.8k points

1 Answer

4 votes
there are 60 minutes in 1 hour, therefore, if the car has a speed of 60 kilometers per hour, that simply means, 60 kilometers per 60 minutes.

now, if the car covers 60 kilometers in 60 minutes, that means in 1 minute, it covers 1 kilometer.

now, if we want to cover every kilometer, not in 1 minute, but half-minute faster than that, that means 1 - 1/2, or 1/2 minute, so, what speed is needed to cover 1 kilometer in just half-minute then?

well, you just need to increase your kilometer per minute from 1 minute, to 1/2, that is , 1 kilometer per 0.5 minutes.

if you can cover 1 kilometer in 0.5 minutes, how many can you cover in 60 minutes or 1 hour? in 1 minute you can cover 2 kilometers at that speed, in 60 minutes then, you can cover 120 kilometers, twice as many.

120 km/h.
User Aleksei Egorov
by
8.1k points

No related questions found

Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.

9.4m questions

12.2m answers

Categories