Question

10. Tom walks at a speed of 9 km/h and runs at a speed of 20 km/h. He has covered the
distance of 10 km in 52 minutes, partly by running and partly by walking. How much time
has he walked for and how much distance has he covered?
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Answer 1

he walked for 40 min and covered 6 km by walking

Step-by-step explanation:

let he walks for x km

then he runs for( 10km -x km)

total time taken =52min=52/60hours

then

x/9 +(10-x) /20=52/60

(20x+90-9x)/180=13/15

(11x+90)/180=13/15

11x+90=(13/15)*180

11x+90=13*12

11x=156-90=66

x=6km

he walks 6km

and runs 10-6=4km

time taken in walking for 6km =6/9=2/3=40/60

he walks for 40min

Answer 2

Answer:

40 min and 6km respectively