RRB Group D Model Set VI

(11) A boy walking at a speed of 45 km /h  reaches his school 10 min late. Next time he increases his speed by 15 km /h but still he is late by 5 min. Find the distance of his school from his house ?

(a) 8 km

(b) 12 km

(c) 18 km

(d) 15 km

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Answer: d

(12) Pravat covers a distance in 40 min if he drives at a speed of 60 km /h on an average. Find the sped at which he must drive at to reduce the time of the journey by 25% .

(a) 65 km/h

(b) 80 km/h

(c) 70 km/h

(d) 75 km/h

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Answer: c

(13) A,B and C can together can do a work in 3 days. If A or B alone can do the work in 8 days, then how long will take C alone to do the same work ?

(a) 16 days

(b) 7 days

(c) 12 days

(d) 18 days

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Answer: c

(14) By which smallest number should 20184 be multiplied so that it becomes perfect square ?

(a) 9

(b) 6

(c) 3

(d) 5

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Answer: b

(15) A man covers a distance of 150 m in 25 s. His speed in km/h is

(a) 24.2

(b) 20

(c) 18

(d) 21.6

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Answer: d

(16) The sum of three consecutive numbers is 87 . The middle number is

(a) 32

(b) 26

(c) 29

(d) 18

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Answer: c

(17) The average of first three numbers is thrice the fourth number. If the average of all the four number is 5, then find the fourth number .

(a) 2

(b) 6

(c) 8

(d) 5

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Answer: a

(18) The LCM of two numbers is 1820 and their HCF is 26. If one number is 130, then the other number is

(a) 120

(b) 364

(c) 257

(d) 70

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Answer: b

(19) The ratio of two numbers is 3 : 4 and their HCF is 4 . Their LCM is

(a) 34

(b) 48

(c) 16

(d) 56

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Answer: b

(20) The square root of    ( 2722 – 128 2 ) is

(a) 176

(b) 265

(c) 240

(d) 170

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Answer: c