A person traveled from his house to office at 30 kmph; then he was late to his office by 5 minutes. If he increases his speed by 10 kmph he would be early by 15 minutes to his office. What should be his speed so that he reaches his office on time ?
Select the correct option:
A) 36 kmph
B) 32 kmph
C) 34 kmph
D) 35 kmph
E) 37 kmph
Let the distance between house and office be x km   (x/30) – (x/40) = 20/40; x/120 = 1/3 x = 40 km   Travlling at 40 kmph, he reaches office in 1 hour i.e. 15 minutes early   So required speed = 40/ 5/4 = 40 * 4/5   = 160/5= 
<gadget id="calculator">160/5</gadget>
<output>32</output>
32 kmph   ANSWER:32 kmph
<result>B</result>
A person traveled from his house to office at 30 kmph; then he was late to his office by 5 minutes. If he increases his speed by 10 kmph he would be early by 15 minutes to his office. What should be his speed so that he reaches his office on time ?