The lengths of two cars, car P and car Q, are (y+20) meters and (y+40) meters respectively. The average of speed of cars P and Q is 45 km/hr. If car Q crosses a pole in 8 seconds and car P crosses the pole in 12 seconds, find the time taken by car Q to cross a platform of length y metres.
1
13.5 sec
2
14.4 sec
3
12.5 sec
4
18.4 sec
5
15.5 sec