A man travelled from the village to the post-office at the rate of 25 kmph and walked back at the rate of 4 kmph. If the whole journey took 5 hours 48 minutes, find the distance of the post-office from the village Answers.
A) 20
B) 87
C) 276
D) 198
E) 171
Explanation:   Average speed = (2 ×a × b)/(a + b) here a = 25 b = 4   Average speed = 2 × 25 × 4/(25 + 4) = 200/29 kmph.   Distance covered in 5 hours 48 minutes = Speed × time   Distance = (200/29) × (29/5) = 40 kms   Distance covered in 5 hours 48 minutes = 40 kms   Distance of the post office from the village = (40/2)= 
<gadget id="calculator">(40/2)</gadget>
<output>20</output>
20 km.   20nswer: 20
<result>A</result>
A man travelled from the village to the post-office at the rate of 25 kmph and walked back at the rate of 4 kmph. If the whole journey took 5 hours 48 minutes, find the distance of the post-office from the village