With average speed of 40 km/h, a train reaches its destination in time. If it goes with an average speed of 35 km/h, it is late by 15 min. The total journey is
30 km
40 km
70 km
80 km
A man makes a profit of 20% on the sale by selling 20 articles for ₹ 1, the number of articles he bought by ₹ 1 is
20
24
25
30
The number of seats in an auditorium is increased by 25%. The price of a ticket is also increased by 12%. Then, the increase in revenue collection will be
40%
35%
45%
48%
A ship is moving at a speed of 30 km/h. To know the depth of the ocean beneath it. It sends a radio wave which travels at a speed 200 m/s. The ship receives the signal after it has moved 500 m. The depth of the ocean is
√143/2 km
12 km
6 km
8 km
C.
6 km
Speed of ship = 30 km/h
Distance = 500 m
Time taken by ship to cover 500 m
Now the radio waves sent go to the seabed and are reflected to reach the detector so the distance travelled by them is double the depth of the ocean = 2d where d is the depth of the ocean
So,
dist. traveled by radio waves = 2d=speed X time
=> 2d = 200 X 60
=> d = 100 X 60=6000m
So the depth of the ocean is 6 km or 6000m
A person takes a loan of ₹ 10000 partly from a bank at 8% per annum and remaining from another bank at 10% per annum. He pays a total interest of ₹ 950 per annum. Amount of loan taken from the first bank (in ₹) is
2500
5200
2050
5020
If the distance between two points (0, -5) and (x, 0) is 13 unit, then x equal to
10
12