Saurabh takes $$15$$ minutes to reach school from his house and Sachin takes one hour to reach school from his house. Find the ratio of the time taken by Saurabh to the time taken by Sachin.
when you compare two quantities then you must make sure that both the quantities should be expressed in the same unit.
Time taken by Saurabh to reach school = $$15$$ minutes
Time taken by Sachin to reach school = $$1$$hour = $$60$$ minutes
Now, the ratio of time taken by Saurabh to that taken by Sachin = $$15$$ / $$60$$
= $$1$$ / $$4$$