A person covers a distance of 47 km in 7 hrs . Some part of this journey is covered on foot at the speed of 5 km/hr and the rest by cycle at the speed of 8 km/hr. Find the distance covered on foot .
Answer & explanation
Correct answer: option 2
Distance = Speed × Time
Total Distance = 47 km
Total Time taken = 7 hours
Let the time he traveled on foot be x hours with speed 5 km/hr
And time he traveled by bicycle is ( 7 - x ) hours with speed 8 km/hr
According to question ,
5 × x + 8 × ( 7 - x ) = 47
5x + 56 - 8x = 47
3x = 9 ⇒ x = 3 hours
So , distance traveled by foot = 5 × 3 = 15 km