Shortcut

The road from the cottage to the shop 6 km away leads either along a straight road that the bicycle can drive at a speed of 18 km/h or by "shortcut". It measures only 3.6 km. But the road from the cottage is all uphill - at a speed of 8 km/h, you can go home downhill at a safe speed of 24 km/h. The purchase takes the same time. Jana goes flat on Monday, Tomáš "shortcut" on Tuesday. Who will be back first?

Result

t1 = 0:40 h Wrong answer
t2 = 0:36 h Wrong answer

Step-by-step explanation:

s1=6 km v1=18 km/h  s2=3.6 km v2=8 km/h v3=24 km/h  t1=2 s1/v1=2 6/18=32=0.66667=0:40 h
t2=s2/v2+s2/v3=3.6/8+3.6/24=53=0.6=0.6=0:36 h  t1>t2  T



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Showing 1 comment:
#
Asem
answer is incorrect
12 miles ÷18 mph = 2/3= .666666666.. .hours. ... You have 0.40 h . (in your defense 2/3 hours is 40 minutes)

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