Q311
A man can walk uphill at the rate of 21/2 km/hr and downhill at the rate of 31/4 km/hr. If the total time required to walk a certain distance up the hill and return to the starting point was 4 hr 36 min, then what was the distance walked up the hill by the man ?
A man can walk uphill at the rate of km/hr and downhill at the rate of km/hr. If the total time required to walk a certain distance up the hill and return to the starting point was 4 hr 36 min, then what was the distance walked up the hill by the man ?
A.
4 km
B.
km
C.
km
D.
km
AnswerAnswer: Option D
Solution
Answer: Option D
Solution:
Average speed :Total time taken :
= 4 hr 36 min
Total distance covered uphill and downhill :
∴ Distance walked uphill :