A square is of side 1 km. A man travels first 2 sides with the 30 mph and third side with 60 kmph. What is the speed that man has to travel the fourth side if the average speed is 60 kmph
Choose the most appropriate option
A) 100 Kmph
B) 110 Kmph
C) 120 Kmph
D) 130 Kmph
E) 140 Kmph
1 Mile= 1.6 Km   Total time taken to travel 3 sides =(1/48)+(1/48)+(1/60)= 7/120 hr   time taken to travel 4 sides at avg speed= 1/15 hr   So, reqred speed for fourth side= 1/{(1/15)-(7/120)}= 120 Kmph   ANSWER:120 Kmph
<result>C</result>
A square is of side 1 km. A man travels first 2 sides with the 30 mph and third side with 60 kmph. What is the speed that man has to travel the fourth side if the average speed is 60 kmph