A man is delayed in reaching his workplace by 30 minutes due to bad traffic as he can drive drive at of his usual speed. What is his usual time(in hours and minutes) of travel?
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. 1 hour 45 minutes.
When same distance travelled then speed becomes 7/9 of usual, time becomes 9/7 times.
Extra Time = Usual Time × {(9/7)−1} = Usual Time × 2/7
Extra Time = 30 minutes
Usual Time = (30 × 7)/2 = 105 minutes = 1 hour 45 minutes