Question

Raj takes a taxi to the airport. He expects the taxi to travel at an average speed of 50 mph.
The distance from Raj's house to the airport is 30 miles.
If Raj's taxi actually travels at an average speed of 40 mph, how many more minutes does the journey take than expected?

Answer 1

9514 1404 393

Answer:

  9 minutes

Step-by-step explanation:

In terms of hours, the travel times are ...

  time = distance/speed

Expected time

  te = (30 mi)/(50 mi/h) = 3/5 h = 36 minutes

Actual time

  ta = (30 mi)/(40 mi/h) = 3/4 h = 45 minutes

Then the extra time taken is ...

  (45 -36) min = 9 minutes

The journey took 9 minutes longer than expected.