Answers

Answer: C 17 MIN. Solution: B is thrice as fast as C C covered in 42 minutes B covered in 42/3=14 min A is twice as fast as B A covers in 14*(1/2) = 7 min

Answer: B 10 sec. Solution: Distance=125 meter speed=50-5=45km/hr=>45*5/18=12.5 m/s Time=125/12.5=10sec

Answer: A 1.2 KM/HR Solution: Let x=speed of boat and y=speed of current =30/ (x+y)=18/(x-y)=5 by solving y=1.2 km/hr

Answer: D 15, 25 Solution: NO. Are in the ratio of 3:5 Let no be 3x and 5x (3x+10): (5x+10) =5:7 X=5 NO are (15, 25)

Answer: C 200. Solution: X/5 + 5 = x/4 – 5 ⇒ x/5 – x/4 = 10 X/20 = 10 ⇒ x = 200

Answer: D Rs. 900 Solution: Let P = Principal A – Amount We have a = P (1 + R/100)3 and CI = A – P ATQ 993 = P (1 + R/100)3 – P ∴ P = Rs 3000/ – Presently SI @ 10% on Rs 3000/ – for 3 yrs = (3000 x […]

Answer: A 76 Meters Solution: Let’s assume A finishes the 600 m race in 60 sec, then 600/60 = 10 m/sec is his speed B traveled (600-60 = 540 m in 60 sec, therefore 540/60 = 9 m/sec is B’s speed : “in a race of 500 metres, B can beat C by 50 metres.” […]

Answer: C 70 Meters. Solution: 20 men in 6 days can build 112 meters 25 men in 30 days can build=112*(25/20)*(3/6) = 70 meters

Answer: a 1000 Solution: Give the yearly portion a chance to be Rs.100. The principal portion will be paid one year from now i.e. 3 years before it is in reality due. The second portion will be paid a long time from now i.e. 2 years before it is in reality due. The third portion […]

Answer: D Rs. 900 Solution: Let P = Principal A – Amount We have a = P (1 + R/100)3 and CI = A – P ATQ 993 = P (1 + R/100)3 – P ∴ P = Rs 3000/ – Presently SI @ 10% on Rs 3000/ – for 3 yrs = (3000 x 10 […]