When a jogger moves at an average speed of 6 kmph, they reach their destination on time. When their average speed becomes 4 kmph, they reach their destination 15 minutes late. Find the length of journey.
Choose the correct choice from the following answers
A) 3 km B) 5 km C) 7 km D) 6 km E) None
Sol.   Difference between timings = 15 min = 1/4 hr.   Let the length of journey be x km.   Then, x/4 - x/6 = 1/4   â‡” 3x - 2x = 3   â‡” x = 3 km.   3 kmnswer 3 km
<result>A</result>
When a jogger moves at an average speed of 6 kmph, they reach their destination on time. When their average speed becomes 4 kmph, they reach their destination 15 minutes late. Find the length of journey.