Answer : 18 sec
Q2. A train crosses an electric pole in 10 seconds with a speed of 60 m/s. Find the length of the train?
Answer : 600 m
Q3. A bus covers a distance of 150 km at a speed of 16.67 m/s. If the bus has to cover 120 km in the same time, find the distance traveled by bus (in meter) per minute.
Answer : 800 m
Q4. Find the time in which a motorboat can cover 128 km against the stream when the rate stream is 4 km/hr and speed of the motor boat with the current is 20 km/hr.
Answer : 10 whole 2/3 hours
Q5. A bus travel first 45 minutes at 52 km/hr and rest 90 km in 1 whole 1/4 an hour. Find the average speed of the bus.
Answer : 64.5 km/hr
Q6. Find the length of the bridge on which a cyclist riding at 24 km/hr crosses it in 9 minutes.
Answer : 3.6 km
Q7. A boat goes 42 km downstream in 56 minutes. The speed of stream in 16 km/hr. Find the speed of the boat in still water.
Answer : 29 km/hr.
Q8. A man travels to his office at 72 km/hr and returns home at 54 km/hr. Find his average speed.
Answer : 61.7 km/hr
Q9. A man can row 20 km downstream in 4 hours and 9 km upstream in 3 hours. Find the speed of man in still water.
Answer : 4 km/hr.
Q10. A man can row upstream at 24 km/hr. And downstream at 30 km/hr. Find the speed of the current.
Answer : 3 km/hr.
Q11. A man can row at 30 km/hr in still water. If the rate of current is 5 km/hr, find the average speed of man if he rows a certain distance upstream and returns back to starting point.
Answer : 29.2 km/hr.
Q12. A bus takes 12 hours from Delhi to reach Chandigarh. The bus covers half of the journey in 1/3𝑟𝑑 of total time and rest of the journey at 25 km/hr. Find the distance between Delhi and Chandigarh.
Answer : 400 km
Q13. Speed of the motorboat against the stream is 12 km/hr. and speed with the stream is 18 km/hr. Find the speed of motorboat in still water.
Answer : 15 km/hr.
Q14. A swimmer can swim 9.6 km/hr in still water. He takes twice the time to swim upstream than to swim downstream. Find the speed of the stream.
Answer : 3.2 km/hr.
Q15. A man traveling with 45 of his usual speed reaches his distance 70 minutes late. Find the usual time he takes to reach his destination.
Answer : 4 whole 2/3hours
