A Salesman took 1/2h to drive from Tuas to Bedok at an average speed of 72km/h. When he returned from Bedok to Tuas, he travelled at an average speed of 90km/h along with the same road. How long did the salesman take to reach Tuas?
INeedHelpPlease
Distance between the two places = (1/2 hours)(72 km/hour) = 36 km
time for return trip = distance/rate = 36/90 = .4 hrs or 24 minutes
so the total time = 1/2 hr + .4 hr = 30 min + 24 min = 54 minutes