By travelling at 40 kmph, a person reaches his destination on time. He covered two-third the total distance in one-third of the total time. What speed should he maintain for the remaining distance to reach his destination on time?
Pick one:  A) 20  B) 99  C) 77  D) 63  E) 61
Let the time taken to reach the destination be 3x hours. Total distance = 40 * 3= 
<gadget id="calculator">40 * 3</gadget>
<output>120</output>
120x km   He covered 2/3 * 120= 
<gadget id="calculator">2/3 * 120</gadget>
<output>80</output>
80x km in 1/3 * 3x= x hours So, the remaining 40x km, he has to cover in 2x hours. Required speed = 40x/2x = 20 kmph.   20nswer: 2040 /2= 
<gadget id="calculator">40 /2</gadget>
<output>20</output>
20 kmph.   20nswer: 20
<result>A</result>
By travelling at 40 kmph, a person reaches his destination on time. He covered two-third the total distance in one-third of the total time. What speed should he maintain for the remaining distance to reach his destination on time?