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P walked from place C to D covering the distance of 25 km and walked from place D to E covering the distance of 60 km in the total time of 6 hours at constant speed. Find the average speed at which P walked to cover distance between place C and place E? 1. 15.67 km/hr2. 20.167 km/hr3. 14.167 km/hr4. 25 km/hr |
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Answer» Correct Answer - Option 3 : 14.167 km/hr Given: P walked from place C to D covering the distance of 25 km and walked from place D to E covering the distance of 60 km in the total time of 6 hours at constant speed. Concepts used: Time = Distance/Speed Calculation: Let the speed be x km/hr. Time = Distance/Speed ⇒ 6 = 25/x + 60/x ⇒ 6 = 85/x ⇒ x = 85/6 km/hr ⇒ x = 14.167 km/hr ∴ Speed at which P walked from place C to E is 14.167 km/hr. |
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