A person covers a distance of 24 km in 7 hours . Some part of this journey is covered on foot at the speed of 3 km/hr and the rest by cycle at the speed of 4 km/hr. Find the distance covered on foot .
Answer & explanation
Correct answer: option 3
Distance = Speed × Time
Total Distance = 24 km
Total Time taken = 7 hours
Let the time he traveled on foot be x hours with speed 3 km/hr
And time he traveled by bicycle is ( 7 - x ) hours with speed 4 km/hr
According to question ,
3 × x + 4 × ( 7 - x ) = 24
3x + 28 - 4x = 24
x = 4 hours
So , distance traveled by foot = 3 × 4 = 12 km