Manish goes to his home town at the speed of 40 km/hr and returns to his home at the speed of Y km/hr. Distance between his home and home town is 360 km. If he takes total 21 hours, then what is the value of Y?
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. 30 km/hr
Time = Distance/Speed
(360/40) + (360/y) = 21
⇒ 360/y = 21 - 9
⇒ 12y = 360 or y = 30km/hr