[ A ] 4.5 seconds 

[ B ] 5.5 seconds  
[ C ] 6.5 seconds  
[ D ] 7.5 seconds 
[ A ] 4.5 seconds 

[ B ] 5.5 seconds  
[ C ] 6.5 seconds  
[ D ] 7.5 seconds 
Answer : Option D 
Explanation : 
time = $160 + 140 \over 77 \times {5 \over 18} + 67 \times {5 \over 18 }$ = $300 \over {5 \over 18} \times 144 $ = $300 \over 40$ = 7.5 seconds 
Copyright 2018  Privacy Policy  Terms and Conditions  Contact us  Advertise
@