Xinran walks 3 mi/h uphill, 4 mi/h on flat land and 5 mi/h downhill. If he walks one mile uphill, then one mile on flat land and then returns by the same route to his starting point, how many minutes does he walk?
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62 minutes or 1 hr 2 min
Step-by-step explanation:
up hill 3 mi/hr so 20 min for 1 mile
on flat land 4 mi/hr so (4/60)that is 15 min
and down land 5 mi/hr so (5/60) that is 12 min
so..
he travels on uphill and flat land and again get return he travels on flat land and down hill.
so .
20 min +15 min+15min +12min
that is equal to 62 min...
.........solved.......
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