4
Q:

# 'K' cycled from A to B at 10 kmph and returned at the rate of 9 kmph. 'L' cycled both ways at 12 kmph. In the whole journey 'L' took 10 minutes less than 'K'. Find the distance between A and B ?

 A) 32.1 km B) 15.23 km C) 3.75 km D) 32.1 m

Explanation:

Let 'd' be the distance between A and B
K -time = d/10 + d/9 = 19d/90 hours
L -time = 2d/12 = d/6 hours
We know that, 10 min = 1/6 hours
Thus, time difference between K and L is given as 10 minutes.
=> 19d/90 - d/6 = 1/6
=> (19d-15d)/90 = 1/6
=> 4d/90 = 1/6
Thus,
d= 15/4 km = 3.75 km.

hence the distance between A and B is 3.75 km.

Q:

Which of the following pairs are co-primes?

 A) 59, 97 B) 348, 296 C) 3025, 4920 D) 114, 213

Explanation:

0 118
Q:

A man travels from point A to B at 40 km/hr and returns from B to A at 60 km/hr. What is his average speed during the whole journey?

 A) 55 km/hr B) 45 km/hr C) 48 km/hr D) 50 km/hr

Explanation:

0 120
Q:

The distance between two stations A and B is 575 km. A train starts from station ‘A’ at 3:00 p.m. and moves towards station ‘B’ at an average speed of 50 km/h. Another train starts from station ‘B’ at 3:30 p.m. and moves towards station ‘A’ at an average speed of 60 km/h. How far from station ‘A’ will the trains meet ?

 A) 275 km B) 325 km C) 300 km D) 225 km

Explanation:

0 164
Q:

A car covers a distance of 20 km in 15 minutes. If its speed is decreased by 10 km/hr, then what will be the time (in minutes) taken by it to cover the same distance?

 A) 150/11 B) 120/7 C) 130/11 D) 150/13

Explanation:

2 150
Q:

A boy walking at the speed of 3 km/hr covers a certain distance in 3 hours 40 minutes. If he covers the same distance by cycle in 11 hours, then what is the speed (in km/hr) of cycle?

 A) 1 B) 2 C) 4 D) 3

Explanation:

0 137
Q:

A aid can cycle at 16 km/h and walk at 7 km/h. To cover a distance of 109 km. she takes 8.5 hours. How much distance did she cover on foot?

 A) 17.5 km B) 24.5 km C) 21 km D) 28 km

Explanation:

0 306
Q:

Mark had to travel 220 km in 4.5 hours, using a train that travels at the speed of 60 km/h or a bus that travels at the speed of 40 km/h, or any combination of the two modes of transport. For how long did he travel by bus?

 A) 1 hour B) 1 hour 30 minutes C) 2 hours 30 minutes D) 2 hours

Explanation:

0 158
Q:

Rain swims in an 80 in long pool. He covers 160 m in one minute by swimming from one end to the other and back, along the same straight path. Find his average speed.

 A) 2.07 ms-1 B) 2.60 ms-1 C) 3.67 ms-1 D) 2.67 ms-1