John goes to his office by car at a speed of 40kmph and reaches 8 minutes earlier. If he goes at a speed of 30kmph , he reaches 4mins late. What is the distance from his house to office? Choose the correct choice from the following answers
A) 18 km	B) 20 km	C) 22 km	D) 24 km	E) 30 km
Let his office time be 10 a.m. He reaches office at 8 minutes earlier when he travels at 40 kmph =&gt; He reaches at 9:52 a.m   He reaches his office 4 minutes late when travels at 30 kmph speed=&gt; He reaches at 10.04 a.m   The time difference is (10.04 – 9.52) = 12 minutes   Let the distance be 24 km and time=   24 kmistance   Speed   T1 – T2 = 12 minutes = 12/60   hours = 1/5hours   24 km/30– 24 km/40= 1/5   (424 km-324 km)/120= 1/5   24 km= 24 km
<result>D</result>
John goes to his office by car at a speed of 40kmph and reaches 8 minutes earlier. If he goes at a speed of 30kmph , he reaches 4mins late. What is the distance from his house to office?