A. 24

B. 12

C. 22.5

D. none of these

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The ratio flat vs hill is unknown so you can’t calculate this normally. But since the average for uphill/downhill is also 4 kmph ((1.5h)/6km)), the calculation is: 6 hours * 4kmph = 24km.

x/3 + y/3 +x/4 + y/6 = 6

x/2 + y/2 = 6

x+y = 12

the total distance is 12…..x being the flat part and y

being the slope..

ans is 24..

bcos he travels x and y distance to times……