Question

1a)Every morning, Jim goes for a morning walk. His normal walking speed is 3 1/2 km per hour, and he walks

a total distance of 10 km every day. How much time does he take to cover one km?
minutes
Answer
17 1/7

1b)How much time does it take him to complete his morning walk?
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Answer 1

9514 1404 393

Answer:

• 17 minutes 8.6 seconds (17 1/7 min)
• 2 hours 51 minutes 26 seconds (2 h 51 3/7 min)

Explanation:

The relationship between time, speed, and distance is ...

time = distance/speed

__

a) For 1 km, the time in hours is ...

time = (1 km)/(3.5 km/h) = 1/3.5 h = 2/7 h

In minutes, that is ...

(60 min/h)(2/7 h) = 120/7 min = 17 1/7 min . . . . time for 1 km

__

b) The time for 10 km is 10 times the time for 1 km, so will be ...

(10)(2/7 h) = 20/7 h = 2 6/7 h

In hours and minutes, that is 2 hours and (6/7)(60 min) = 360/7 min = 51 3/7 min.

The time for 10 km is 2 hours 51 3/7 minutes.