13. A senior citizen walks 0.30 km in 10 min, going around ashopping mall. (a) W

Question

13. A senior citizen walks 0.30 km in 10 min, going around ashopping mall. (a) What is her avg speed in meters per second? (b)If she wants to increase her avg speed by 20% in walking a secondlap, what would her avg travel time in minutes have to be? I started with .30km / 10mins = .30(.278)m/s / 10(60) Do not think I start correctly! Can someone help? 13. A senior citizen walks 0.30 km in 10 min, going around ashopping mall. (a) What is her avg speed in meters per second? (b)If she wants to increase her avg speed by 20% in walking a secondlap, what would her avg travel time in minutes have to be? I started with .30km / 10mins = .30(.278)m/s / 10(60) Do not think I start correctly! Can someone help?

Explanation / Answer

A senior citizen walks 0.30 km in 10 min, going around ashopping mall.

(a) What is her avg speed in meters per second?

.3km/10min x1000m/km x 1min/60s= .5m/s

(b) If she wants to increase her avg speed by 20% in walking asecond lap, what would her avg travel time in minutes have tobe? increase by 20 % then new speed is 120% = 1.2

1.2(.5)m/s= .6m/s

.3 km= 300m >>>>> divide by velocity=time>>> 300/.6=500s /60= 8.33min

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