Question

LB
109 A car travelling at 72 km/h covers a
certain distance in 6 hours. What
should be the decrease in speed, if the
same distance is to be covered in
8 hours ? What time will it take to
cover the same distance at the speed of
90 km/h?​

Answer 1

Answer:

Step-by-step explanation:

Given that time taken for riding both ways will be  

2

hours lesser than the time needed for waking one way and riding back.

Therefore,

time needed for riding one way = time needed for waking one way -  

$2 hours$

Given that time taken in walking one way and riding back  

$=5 hours 45 min$

Hence, the time he would take to walk both ways

$=5 hours 45 min + 2 hours=7 hours 45 min$