Question

If a man walks 20 km at 5 km/hr, he will be late by 40 minutes. if he walk at 8 km per hr, how early from the fixed time will he reach?

• A. 15 minutes
• B. 25 minutes
• C. 50 minutes
• D. 1.5 hours
• E. None of these

Answer 1

Answer: (C)

50 minutes

Time taken to cover 20 km at speed 5 km/hr = 4 hours
$\therefore$ Fixed time = 4 hour - 40 minutes = 3 hour 20 min
Time taken to cover 20 km at the speed 8 km/hr = 20/8 = 2 hours 30 minutes
$\therefore$ Required time = 3 hours 20 minutes - 2 hr 30 min
=50 minutes