A person traverses a certain distance in 1 hour 24 minutes by covering two-thirds of the distance at 4 km per hour and the rest at 5 km per hour. Find the distance covered by the person.
A6 km ✓ Correct
B8 km
C6.5 km
D7 km
Correct answer: (A) 6 km
Explanation
The distance covered is 6 km.
Total time 1 hr 24 min = 1.4 hr; let distance = d.
Time = (2d/3)/4 + (d/3)/5 = d/6 + d/15.
d/6 + d/15 = 7d/30 = 1.4.
d = 1.4 * 30 / 7 = 6 km.
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