Points 'A' and 'B' are 70 km apart on a highway and two cars start at the same time. If they travel in the same direction, they meet in 7 hours, but if they travel towards each other they meet in one hour. Find the speed of the two cars (in km/hr).
A. 20, 30
B. 40, 30
C. 30, 50
D. 20, 40
Answer: Option B
Solution(By Examveda Team)
Let the speed of the cars be S1 and S2And S1 - S2 = $$\frac{70}{7}$$ = 10 . . . . . (i)
Also S1 + S2 = $$\frac{70}{1}$$ = 70 . . . . . (ii)
From equation (i) and (ii)
S1 = $$\frac{10 + 70}{2}$$ = 40 km /hr
And S2 = $$\frac{70 - 10}{2}$$ = 30 km / hr
∴ Required speeds are 40 km/hr and 30 km/hr
Related Questions on Speed Time and Distance
A. 48 min.
B. 60 min.
C. 42 min.
D. 62 min.
E. 66 min.
A. 262.4 km
B. 260 km
C. 283.33 km
D. 275 km
E. None of these
A. 4 hours
B. 4 hours 30 min.
C. 4 hours 45 min.
D. 5 hours
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