If a car runs at a constant speed and takes 4.5 hrs to ru...
If a car runs at a constant speed and takes 4.5 hrs to run a distance of 225 km, what time will it take to run 150 km?
2 hrs
4 hrs
3 hrs3 hrs
1 hr
Correct answer is C
Let T be the time taken and D is the distance
For the case given in the problem, the distance covered is directly proportional to the time taken i.e D α T
⇒ D = ST where S is the constant speed
D = 225 km and T = 4.5 hrs
∴ 225 = S x 4.5
S = 2254.5 = 50km/hr
When D = 150km
D = ST
150 = 50 × T
T = 15050 = 3 hrs
So it will take 3 hrs
The figure above is a Venn diagram showing the elements arranged within sets A,B,C,ε. ...
Solve the inequality: -7 ≤ 9 - 8x < 16 - x...
What is the difference in longitude between P (lat. 50°N. long. 50°W) and Q (lat.50°N, l...
find the radius of a sphere whose surface area is 154cm2 (π=227)...