Joy Shaha wrote:Q. If Deepti had walked 20km/h faster, she would have saved 1 hour in the distance of 600 km. what is usual speed of Deepti?
a) 100
b)120
c)150
d)none of these
We can PLUG IN THE ANSWERS, which represent the usual speed.
When the correct answer choice is plugged in, traveling 20kph faster will take 1 hour less than traveling at the usual speed.
The answers choices imply the following:
A: 100kph = usual speed, 120kph = faster speed
B: 120kph = usual speed, 140kph = faster speed
C: 150kph = usual speed, 170kph = faster speed
Since the difference between the two times is an integer value, the two speeds are almost certain to divide evenly into the distance of 600k.
Only
A offers two values that divide evenly into 600.
A: 100kph = usual speed, 120kph = faster speed
Time at the usual speed = d/r = 600/100 = 6 hours.
Time at the faster speed = d/r = 600/120 = 5 hours.
Time difference = 6-5 = 1 hour.
Success!
The correct answer is
A.
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