Multiple choice

A man walks at a certain speed and reaches destination in 1 hr 40 minutes which is 6 km far. If he covers the same distance in 1 hr 20 minutes, what is the difference in speed?( In km/hr)

  1. 1

  2. 0.9

  3. 1.5

  4. 1.9

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Speed1 = 6 km ÷ (5/3) hr = 3.6 km/hr (1 hr 40 min = 5/3 hr). Speed2 = 6 km ÷ (4/3) hr = 4.5 km/hr (1 hr 20 min = 4/3 hr). Difference = 4.5 - 3.6 = 0.9 km/hr. The difference is positive since the second speed is greater.