Question
A goods train leaves a station at a certain time and at
a fixed speed. After 9 hours, an express train leaves the same station and moves in the same direction at a uniform speed of 128 km/hr, this train catches up the goods train in 7 hours. Find the speed of the goods train.Solution
Let the speed of the goods train be ‘s’ km/hr Distance covered by goods train in 16 hrs = s x 16 km Distance covered by express train in 7 hrs = 7 x 128 km Distance covered by goods train in 16 hrs = Distance covered by express train in 7 hrs So, 16s = 7 × 128 ⇒ 16s = 896 ⇒ s = 896/16 = 56 So, Speed of goods train = 56 km/hr
‘Bagging’ or protective covering of fruit clusters is commonly used to protect against which type of pest?
A bacterial disease of silkworm turns the color of larva to black and emits the foul smell. Name of the disease is:
Which of the following is true about the immature scale insects?
Kerria sp. is a …. species of lac insect.
Chili leaf curl disease is spread by vector_________
___________signifies the separation between the old exocuticle and the epidermis, creating a narrow space that aids in the molting process.
Which of the following is not a natural predator of BPH?
Which insecticidal compound primarily interferes with the axonal transmission, prolonging the closure of sodium gated channels in the nervous system?
 Apis mellifera is also known as
Which of the following insects is the carrier of grassy stunt pathogenic virus?
Relevant for Exams:
