mangamma wrote:
Speed of Jane is 20 mph, with which he travels for ‘t’ hours. In order to keep the distance travelled same, by what percentage should the time ‘t’ be increased if the speed drops down by 20%?
A) 10%
B) 20%
C) 25%
D) 30%
E) 35%
Instead of solving, we can make use of numbers to arrive at the answer.
Initial speed=20mph
Let us assume t=4 hours
Then distance travelled=80miles
New speed=16mph
time taken to travel 80 miles=5 hours
i.e. t has increased from 4 to 5, which is 25%
Ans:C
_________________
Please hit kudos if you like my answers.
GMAT:710 (Q49,V38,IR8,AWA5)