Two cars, Car1 and Car2 move towards each other from Z and Y respectively with respective speeds of 20 m/s and 15 m/s. After meeting each other Car1 reaches Y in 10 seconds. In how many seconds does Car 2 reach Z starting from Y?
Choose the correct answer
A) 15.5 sec
B) 8.4 sec
C) 33.6 sec
D) 31.11 sec
E) 16.8 sec
Z--------------------------------------|----------------------------Y   Car A(20mps)-------------------------&gt;P&lt;---------------Car B(15mps)   Let 2 cars meet each other at point P in t seconds.   Car1 covers distance= 20t. Car2 covers distance=15t. So, total distance ZY= 35t.   From P, Car 1 reaches onto Y in 10 secs. So it covers 15t further.   so, 15t/20 = 10   So t=40/3 sec and total distance = (35*40)/3   Hence Car2 will cover total distance in (35*40)/(3*15) = 31.11 sec approx.   Answer 31.11 sec
<result>D</result>
Two cars, Car1 and Car2 move towards each other from Z and Y respectively with respective speeds of 20 m/s and 15 m/s. After meeting each other Car1 reaches Y in 10 seconds. In how many seconds does Car 2 reach Z starting from Y?